As officers searched Florida school, shooting suspect was shopping

Nikolas Jacob Cruz took an Uber to get to Marjory Stoneman Douglas High School, where he shot up several classrooms with a high-powered rifle before escaping and managing to evade officers for more than hour, Florida authorities said Thursday.

Once he was on the loose, Cruz eluded officers long enough to stop by a Walmart and a McDonald's before he was captured and confessed everything, according to law enforcement officials and court documents.

The account was the first detailed picture of one of the nation's most deadly school shootings, in which 17 people were killed and 14 others wounded.

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Shooting at Marjory Stoneman Douglas High School in Florida
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Shooting at Marjory Stoneman Douglas High School in Florida
PARKLAND, FL - FEBRUARY 14: People are brought out of the Marjory Stoneman Douglas High School after a shooting at the school that reportedly killed and injured multiple people on February 14, 2018 in Parkland, Florida. Numerous law enforcement officials continue to investigate the scene. (Photo by Joe Raedle/Getty Images)
PARKLAND, FL - FEBRUARY 14: People wait for loved ones as they are brought out of the Marjory Stoneman Douglas High School after a shooting at the school that reportedly killed and injured multiple people on February 14, 2018 in Parkland, Florida. Numerous law enforcement officials continue to investigate the scene. (Photo by Joe Raedle/Getty Images)
Students leave Marjory Stoneman Douglas High School in Parkland, Florida, a city about 50 miles (80 kilometers) north of Miami on February 14, 2018 following a school shooting. A gunman opened fire at the Florida high school, an incident that officials said caused 'numerous fatalities' and left terrified students huddled in their classrooms, texting friends and family for help. The Broward County Sheriff's Office said a suspect was in custody. / AFP PHOTO / Eva Claire HAMBACH (Photo credit should read EVA CLAIRE HAMBACH/AFP/Getty Images)
PARKLAND, FL - FEBRUARY 14: People are brought out of the Marjory Stoneman Douglas High School after a shooting at the school that reportedly killed and injured multiple people on February 14, 2018 in Parkland, Florida. Numerous law enforcement officials continue to investigate the scene. (Photo by Joe Raedle/Getty Images)
Students are released from a lockdown outside of Stoneman Douglas High School in Parkland, Fla. after reports of an active shooter on Wednesday, Feb. 14, 2018. (John McCall/Sun Sentinel/TNS via Getty Images)
Medical personnel tend to a victim outside of Stoneman Douglas High School in Parkland, Fla. after reports of an active shooter on Wednesday, Feb. 14, 2018. (John McCall/Sun Sentinel/TNS via Getty Images)
Medical personnel tend to a victim outside of Stoneman Douglas High School in Parkland, Fla. after reports of an active shooter on Wednesday, Feb. 14, 2018. (John McCall/Sun Sentinel/TNS via Getty Images)
Police and security vehicles are seen at Marjory Stoneman Douglas High School in Parkland, Florida, a city about 50 miles (80 kilometers) north of Miami on February 14, 2018 following a school shooting. A gunman opened fire at the Florida high school, an incident that officials said caused 'numerous fatalities' and left terrified students huddled in their classrooms, texting friends and family for help. The Broward County Sheriff's Office said a suspect was in custody. / AFP PHOTO / Michele Eve SANDBERG / The erroneous mention[s] appearing in the metadata of this photo by Michele Eve SANDBERG has been modified in AFP systems in the following manner: [Byline: Michele Eve SANDBERG] instead of [Eva Hambach]. Please immediately remove the erroneous mention from all your online services and delete it from your servers. If you have been authorized by AFP to distribute it to third parties, please ensure that the same actions are carried out by them. Failure to promptly comply with these instructions will entail liability on your part for any continued or post notification usage. Therefore we thank you very much for all your attention and prompt action. We are sorry for the inconvenience this notification may cause and remain at your disposal for any further information you may require. (Photo credit should read MICHELE EVE SANDBERG/AFP/Getty Images)
Students react following a shooting at Marjory Stoneman Douglas High School in Parkland, Florida, a city about 50 miles (80 kilometers) north of Miami on February 14, 2018. A gunman opened fire at the Florida high school, an incident that officials said caused 'numerous fatalities' and left terrified students huddled in their classrooms, texting friends and family for help. The Broward County Sheriff's Office said a suspect was in custody. / AFP PHOTO / Michele Eve Sandberg (Photo credit should read MICHELE EVE SANDBERG/AFP/Getty Images)
PARKLAND, FL - FEBRUARY 14: The Marjory Stoneman Douglas High School is seen after a shooting at the school that reportedly killed and injured multiple people on February 14, 2018 in Parkland, Florida. Numerous law enforcement officials continue to investigate the scene. (Photo by Joe Raedle/Getty Images)
Security speak with people near Marjory Stoneman Douglas High School in Parkland, Florida, a city about 50 miles (80 kilometers) north of Miami on February 14, 2018 following a school shooting. A gunman opened fire at the Florida high school, an incident that officials said caused 'numerous fatalities' and left terrified students huddled in their classrooms, texting friends and family for help. The Broward County Sheriff's Office said a suspect was in custody. / AFP PHOTO / Michelle Eve SANDBERG (Photo credit should read MICHELLE EVE SANDBERG/AFP/Getty Images)
PARKLAND, FL - FEBRUARY 14: People are brought out of the Marjory Stoneman Douglas High School after a shooting at the school that reportedly killed and injured multiple people on February 14, 2018 in Parkland, Florida. Numerous law enforcement officials continue to investigate the scene. (Photo by Joe Raedle/Getty Images)
Students gather following a shooting at Marjory Stoneman Douglas High School in Parkland, Florida, a city about 50 miles (80 kilometers) north of Miami, February 14, 2018 . A gunman opened fire at the Florida high school, an incident that officials said caused 'numerous fatalities' and left terrified students huddled in their classrooms, texting friends and family for help. The Broward County Sheriff's Office said a suspect was in custody. / AFP PHOTO / Michele Eve Sandberg (Photo credit should read MICHELE EVE SANDBERG/AFP/Getty Images)
A student wears a Valentine's pin as she leaves Marjory Stoneman Douglas High School in Parkland, Florida, a city about 50 miles (80 kilometers) north of Miami on February 14, 2018 following a school shooting. A gunman opened fire at the Florida high school, an incident that officials said caused 'numerous fatalities' and left terrified students huddled in their classrooms, texting friends and family for help. The Broward County Sheriff's Office said a suspect was in custody. / AFP PHOTO / Michele Eve Sandberg (Photo credit should read MICHELE EVE SANDBERG/AFP/Getty Images)
PARKLAND, FL - FEBRUARY 14: Fire Rescue personnel work the scene at the Marjory Stoneman Douglas High School after a shooting at the school that reportedly killed and injured multiple people on February 14, 2018 in Parkland, Florida. Numerous law enforcement officials continue to investigate the scene. (Photo by Joe Raedle/Getty Images)
Police and fire rescue vehicles converge on Stoneman Douglas High School in Parkland, Fla. after reports of an active shooter on Wednesday, Feb. 14, 2018. (John McCall/Sun Sentinel/TNS via Getty Images)
MAJORY STONEMAN DOUGLAS HIGH SCHOOL, PARKLAND, FLORIDA - OCTOBER 31, 2017: Marjory Stoneman Douglas High School in Parkland, Broward County, Florida. (Photo DigitalGlobe via Getty Images)
Students leave Marjory Stoneman Douglas High School in Parkland, Florida, a city about 50 miles (80 kilometers) north of Miami on February 14, 2018 following a school shooting. A gunman opened fire at the Florida high school, an incident that officials said caused 'numerous fatalities' and left terrified students huddled in their classrooms, texting friends and family for help. The Broward County Sheriff's Office said a suspect was in custody. / AFP PHOTO / Michele Eve Sandberg (Photo credit should read MICHELE EVE SANDBERG/AFP/Getty Images)
Parents confer with security following a shooting at Marjory Stoneman Douglas High School in Parkland, Florida, a city about 50 miles (80 kilometers) north of Miami, February 14, 2018 . A gunman opened fire at the Florida high school, an incident that officials said caused 'numerous fatalities' and left terrified students huddled in their classrooms, texting friends and family for help. The Broward County Sheriff's Office said a suspect was in custody. / AFP PHOTO / Michele Eve SANDBERG (Photo credit should read MICHELE EVE SANDBERG/AFP/Getty Images)
Police officers ride in the back of a pick up truck with a victim outside of Stoneman Douglas High School in Parkland, Fla. after reports of an active shooter on Wednesday, Feb. 14, 2018. (John McCall/Sun Sentinel/TNS via Getty Images)
A law enforcement officer directs traffic outside of Stoneman Douglas High School in Parkland, Fla. after reports of an active shooter on Wednesday, Feb. 14, 2018. (John McCall/Sun Sentinel/TNS via Getty Images)
A young woman who just walked out from the direction of the high school, who refused to give her name, gets a hug as she reaches the overpass at Coral Springs Drive and the Sawgrass Expressway just south of the campus of Marjorie Stonemason Douglas High School where a shooting occurred on Wednesday, Feb. 14, 2018 in Parkland, Fla. (Amy Beth Bennett/Sun Sentinel/TNS via Getty Images)
A student reacts as she talks to a television reporter at Marjory Stoneman Douglas High School in Parkland, Florida, a city about 50 miles (80 kilometers) north of Miami on February 14, 2018 following a school shooting. A gunman opened fire at the Florida high school, an incident that officials said caused 'numerous fatalities' and left terrified students huddled in their classrooms, texting friends and family for help. The Broward County Sheriff's Office said a suspect was in custody. / AFP PHOTO / Michele Eve SANDBERG (Photo credit should read MICHELE EVE SANDBERG/AFP/Getty Images)
SWAT vehicles converge on Stoneman Douglas High School in Parkland, Fla. after reports of an active shooter on Wednesday, Feb. 14, 2018. (John McCall/Sun Sentinel/TNS via Getty Images)
Students react at Marjory Stoneman Douglas High School in Parkland, Florida, a city about 50 miles (80 kilometers) north of Miami on February 14, 2018 following a school shooting. A gunman opened fire at the Florida high school, an incident that officials said caused 'numerous fatalities' and left terrified students huddled in their classrooms, texting friends and family for help. The Broward County Sheriff's Office said a suspect was in custody. / AFP PHOTO / Michele Eve SANDBERG (Photo credit should read MICHELE EVE SANDBERG/AFP/Getty Images)
People react at Marjory Stoneman Douglas High School in Parkland, Florida, a city about 50 miles (80 kilometers) north of Miami on February 14, 2018 following a school shooting. A gunman opened fire at the Florida high school, an incident that officials said caused 'numerous fatalities' and left terrified students huddled in their classrooms, texting friends and family for help. The Broward County Sheriff's Office said a suspect was in custody. / AFP PHOTO / Michele Eve SANDBERG (Photo credit should read MICHELE EVE SANDBERG/AFP/Getty Images)
PARKLAND, FL - FEBRUARY 14: People are brought out of the Marjory Stoneman Douglas High School after a shooting at the school that reportedly killed and injured multiple people on February 14, 2018 in Parkland, Florida. Numerous law enforcement officials continue to investigate the scene. (Photo by Joe Raedle/Getty Images)
Students are released from a lockdown outside of Stoneman Douglas High School in Parkland, Fla. after reports of an active shooter on Wednesday, Feb. 14, 2018. (John McCall/Sun Sentinel/TNS via Getty Images)
PARKLAND, FL - FEBRUARY 14: People are brought out of the Marjory Stoneman Douglas High School after a shooting at the school that reportedly killed and injured multiple people on February 14, 2018 in Parkland, Florida. Numerous law enforcement officials continue to investigate the scene. (Photo by Joe Raedle/Getty Images)
Students are evacuated by police out of Stoneman Douglas High School in Parkland, Fla., after a shooting on Wednesday, Feb. 14, 2018. (Mike Stocker/Sun Sentinel/TNS via Getty Images)
PARKLAND, FL - FEBRUARY 14: People are brought out of the Marjory Stoneman Douglas High School after a shooting at the school that reportedly killed and injured multiple people on February 14, 2018 in Parkland, Florida. Numerous law enforcement officials continue to investigate the scene. (Photo by Joe Raedle/Getty Images)
Students react following a shooting at Marjory Stoneman Douglas High School in Parkland, Florida, a city about 50 miles (80 kilometers) north of Miami on February 14, 2018. A gunman opened fire at the Florida high school, an incident that officials said caused 'numerous fatalities' and left terrified students huddled in their classrooms, texting friends and family for help. The Broward County Sheriff's Office said a suspect was in custody. / AFP PHOTO / Michele Eve Sandberg (Photo credit should read MICHELE EVE SANDBERG/AFP/Getty Images)
Students react following a shooting at Marjory Stoneman Douglas High School in Parkland, Florida, a city about 50 miles (80 kilometers) north of Miami on February 14, 2018. A gunman opened fire at the Florida high school, an incident that officials said caused 'numerous fatalities' and left terrified students huddled in their classrooms, texting friends and family for help. The Broward County Sheriff's Office said a suspect was in custody. / AFP PHOTO / Michele Eve Sandberg (Photo credit should read MICHELE EVE SANDBERG/AFP/Getty Images)
Students react following a shooting at Marjory Stoneman Douglas High School in Parkland, Florida, a city about 50 miles (80 kilometers) north of Miami on February 14, 2018. A gunman opened fire at the Florida high school, an incident that officials said caused 'numerous fatalities' and left terrified students huddled in their classrooms, texting friends and family for help. The Broward County Sheriff's Office said a suspect was in custody. / AFP PHOTO / Michele Eve Sandberg (Photo credit should read MICHELE EVE SANDBERG/AFP/Getty Images)
Students are brought across Coral Springs Drive from the campus of Stoneman Douglas High School in Parkland, Fla., after a shooting on Wednesday, Feb. 14, 2018. (Amy Beth Bennett/Sun Sentinel/TNS via Getty Images)
Waiting for word from students at Coral Springs Drive and the Sawgrass Expressway just south of the campus of Stoneman Douglas High School in Parkland, Fla., after a shooting on Wednesday, Feb. 14, 2018. (Amy Beth Bennett/Sun Sentinel/TNS via Getty Images)
SWAT vehicles converge on Stoneman Douglas High School in Parkland, Fla. after reports of an active shooter on Wednesday, Feb. 14, 2018. (John McCall/Sun Sentinel/TNS via Getty Images)
Waiting for word from students at Coral Springs Drive and the Sawgrass Expressway just south of the campus of Stoneman Douglas High School in Parkland, Fla., after a shooting on Wednesday, Feb. 14, 2018. (Amy Beth Bennett/Sun Sentinel/TNS via Getty Images)
Trauma surgeon Dr. Igor Nichiporenko (C) and director for emergency medicine Dr. Evan Boyar (R) address the media outside the Broward Health Emergency facility where victims were taken following a shooting at Marjory Stoneman Douglas High School in Parkland, Florida, a city about 50 miles (80 kilometers) north of Miami on February 14, 2018. Seventeen people were killed when a 19-year-old former student opened fire with a semi-automatic rifle at the Florida high school, the local sheriff said, calling the scene 'horrific.' Broward County Sheriff Steve Israel said the victims were a mix of students and adults, though he could not confirm if the adults were teachers. / AFP PHOTO / Michele Eve SANDBERG (Photo credit should read MICHELE EVE SANDBERG/AFP/Getty Images)
Waiting for word from students at Coral Springs Drive and the Sawgrass Expressway just south of the campus of Stoneman Douglas High School in Parkland, Fla., after a shooting on Wednesday, Feb. 14, 2018. (Amy Beth Bennett/Sun Sentinel/TNS via Getty Images)
Florida Governor Rick Scott (4th-L) visits Marjory Stoneman Douglas High School following a shooting that killed 17 people on February 14, 2018 in Parkland, Florida. A former student armed with an AR-15 rifle opened fire at a Florida high school, killing at least 17 people, officials said, in a harrowing shooting spree that saw terrified students hiding in closets and under desks as they texted for help. Broward County Sheriff Scott Israel identified the gunman as Nikolas Cruz, 19, a former student at Marjory Stoneman Douglas High School in Parkland who had been expelled for 'disciplinary reasons.' / AFP PHOTO / Gaston De Cardenas (Photo credit should read GASTON DE CARDENAS/AFP/Getty Images)
BROWARD, UNITED STATES - FEBRUARY 14: Students meet their families following a school shooting at Marjory Stoneman Douglas High School in Broward, Florida on February 14, 2018. At least 17 people were killed Wednesday when a lone gunman opened fire on a Florida high school, according to police. The victims are a mix of students and adults, officials said. (Photo by Carlos Miller/Anadolu Agency/Getty Images)
Police vehicles block the road to Marjory Stoneman Douglas High School in Parkland, Florida, following a shooting that killed 17 people on February 14, 2018 in Parkland, Florida. A former student armed with an AR-15 rifle opened fire at a Florida high school, killing at least 17 people, officials said, in a harrowing shooting spree that saw terrified students hiding in closets and under desks as they texted for help. Broward County Sheriff Scott Israel identified the gunman as Nikolas Cruz, 19, a former student at Marjory Stoneman Douglas High School in Parkland who had been expelled for 'disciplinary reasons.' / AFP PHOTO / Gaston De Cardenas (Photo credit should read GASTON DE CARDENAS/AFP/Getty Images)
PARKLAND, FL - FEBRUARY 14: Nathanael Clark (L) and his father, John Clark, speak to the media after Nathanael escaped the shooting at Marjory Stoneman Douglas High School that killed 17 people on February 14, 2018 in Parkland, Florida. Numerous law enforcement officials continue to investigate the scene. (Photo by Joe Raedle/Getty Images)
PARKLAND, FL - FEBRUARY 14: Sarah Crescitelli leans on her mother, Stacy Crescitelli (L) after she escaped the shooting at Marjory Stoneman Douglas High School that killed 17 people on February 14, 2018 in Parkland, Florida. Numerous law enforcement officials continue to investigate the scene. (Photo by Joe Raedle/Getty Images)
The location where suspect Nikolas Cruz was caught by police at a townhouse in Pelican Pointe at Wyndham Lakes in Coral Cables, Florida following the deadly shooting at Marjory Stoneman Douglas High School in Parkland, Florida on Febreuary 14, 2018. A former student armed with an AR-15 rifle opened fire at a Florida high school, killing at least 17 people, officials said, in a harrowing shooting spree that saw terrified students hiding in closets and under desks as they texted for help. Broward County Sheriff Scott Israel identified the gunman as Nikolas Cruz, 19, a former student at Marjory Stoneman Douglas High School in Parkland who had been expelled for 'disciplinary reasons.' / AFP PHOTO / Michele Eve SANDBERG (Photo credit should read MICHELE EVE SANDBERG/AFP/Getty Images)
Parents meet at the Fort Lauderdale Marriott Coral Springs Hotel to pick up their children following a mass shooting at nearby Marjory Stoneman Douglas High School in Parkland, Fla., on Wednesday, Feb. 14, 2018. (Jim Rassol/Sun Sentinel/TNS via Getty Images)
Parents meet at the Fort Lauderdale Marriott Coral Springs Hotel to pick up their children following a mass shooting at nearby Marjory Stoneman Douglas High School in Parkland, Fla., on Wednesday, Feb. 14, 2018. (Jim Rassol/Sun Sentinel/TNS via Getty Images)
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Cruz, 19, was being held without bond on 17 counts of first-degree premeditated murder in the attack at Douglas High in Parkland, which expelled him last year for disciplinary reasons, according to officials and court documents.

According to a booking affidavit filed Thursday by the Broward County Sheriff's Office, "Cruz stated that he was the gunman who entered the school campus armed with a AR-15 and began shooting students that he saw in the hallways and on the school grounds. Cruz stated that he brought additional loaded magazines to the school campus and kept them hidden in a back pack until he got on campus to begin his assault."

The sheriff's office said he got to the school by ordering a ride from Uber. Deputies tracked down the driver, who said she dropped Cruz off at 2:19 p.m. ET, toward the end of the school day, according to the booking affidavit.

Sheriff Scott Israel told reporters at a news conference Thursday afternoon that the driver didn't know what her passenger was planning and was completely blameless.

14 PHOTOS
Florida high school shooting suspect Nikolas Cruz
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Florida high school shooting suspect Nikolas Cruz
Photo Credit: Broward County Sheriff’s Office
Photo Credit: Instagram
Nikolas Cruz (C) appears via video monitor with Melisa McNeill (R), his public defender, at a bond court hearing after being charged with 17 counts of premeditated murder, in Fort Lauderdale, Florida, U.S., February 15, 2018. REUTERS/Susan Stocker/Pool
Suspected school shooter Nikolas Cruz makes a video appearance in Broward County court before Judge Kim Theresa Mollica on Thursday, Feb. 15, 2018. Cruz is facing 17 charges of premeditated murder in the mass shooting at Marjory Stoneman Douglas High School in Parkland, Fla. (Susan Stocker/Sun Sentinel/TNS via Getty Images)
Suspected school shooter Nikolas Cruz makes a video appearance in Broward County court before Judge Kim Theresa Mollica on Thursday, Feb. 15, 2018. Cruz is facing 17 charges of premeditated murder in the mass shooting at Marjory Stoneman Douglas High School in Parkland, Fla. (Susan Stocker/Sun Sentinel/TNS via Getty Images)
Suspected school shooter Nikolas Cruz makes a video appearance in Broward County court before Judge Kim Theresa Mollica on Thursday, Feb. 15, 2018. Cruz is facing 17 charges of premeditated murder in the mass shooting at Marjory Stoneman Douglas High School in Parkland, Fla. (Susan Stocker/Sun Sentinel/TNS via Getty Images)
Suspected school shooter Nikolas Cruz makes a video appearance in Broward County court before Judge Kim Theresa Mollica on Thursday, Feb. 15, 2018. Cruz is facing 17 charges of premeditated murder in the mass shooting at Marjory Stoneman Douglas High School in Parkland, Fla. (Susan Stocker/Sun Sentinel/TNS via Getty Images)
FORT LAUDERDALE, FL - FEBRUARY 15: Nikolas Cruz, 19, a former student at Marjory Stoneman Douglas High School in Parkland, Florida, where he allegedly killed 17 people, is seen on a closed circuit television screen during a bond hearing in front of Broward Judge Kim Mollica at the Broward County Courthouse on February 15, 2018 in Fort Lauderdale, Florida. Mr. Cruz is possibly facing 17 counts of premeditated murder in the school shooting. (Photo by Susan Stocker - Pool/Getty Images)
FORT LAUDERDALE, FL - FEBRUARY 15: Prosecutor Shari Tate (L) attends the hearing for Nikolas Cruz, 19, a former student at Marjory Stoneman Douglas High School in Parkland, Florida, where he allegedly killed 17 people, during a bond hearing in front of Broward Judge Kim Mollica at the Broward County Courthouse on February 15, 2018 in Fort Lauderdale, Florida. Mr. Cruz is possibly facing 17 counts of premeditated murder in the school shooting. (Photo by Susan Stocker - Pool/Getty Images)
FORT LAUDERDALE, FL - FEBRUARY 15: Nikolas Cruz, 19, a former student at Marjory Stoneman Douglas High School in Parkland, Florida, where he allegedly killed 17 people, is seen on a closed circuit television screen during a bond hearing in front of Broward Judge Kim Mollica at the Broward County Courthouse on February 15, 2018 in Fort Lauderdale, Florida. Mr. Cruz is possibly facing 17 counts of premeditated murder in the school shooting. (Photo by Susan Stocker - Pool/Getty Images)
Nikolas Cruz, facing 17 charges of premeditated murder in the mass shooting at Marjory Stoneman Douglas High School in Parkland, appears in court for a status hearing before Broward Circuit Judge Elizabeth Scherer in Fort Lauderdale, Florida, U.S. February 19, 2018. REUTERS/Mike Stocker/Pool
Nikolas Cruz, facing 17 charges of premeditated murder in the mass shooting at Marjory Stoneman Douglas High School in Parkland, appears in court for a status hearing in Fort Lauderdale, Florida, U.S. February 19, 2018. REUTERS/Mike Stocker/Pool TPX IMAGES OF THE DAY
Nikolas Cruz, facing 17 charges of premeditated murder in the mass shooting at Marjory Stoneman Douglas High School in Parkland, appears in court for a status hearing in Fort Lauderdale, Florida, U.S. February 19, 2018. REUTERS/Mike Stocker/Pool
Nikolas Cruz, facing 17 charges of premeditated murder in the mass shooting at Marjory Stoneman Douglas High School in Parkland, appears in court for a status hearing before Broward Circuit Judge Elizabeth Scherer in Fort Lauderdale, Florida, U.S. February 19, 2018. REUTERS/Mike Stocker/Pool
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Related: Who is Florida school shooting suspect Nikolas Cruz?

Within barely two minutes of being dropped off, Cruz had started firing into four classrooms in Building 12, returning to two of them to shoot again, Israel said.

Cruz then went upstairs to the second floor, where he shot one of his victims, before proceeding to the third floor, which is where he ditched his rifle and backpack, Israel said.

He then ran down the stairs and outside, where he blended in with hundreds of terrified students — many of them his former classmates — and eluded officers as he left campus, Israel said.

Amid the chaos he'd left behind at the school, Cruz made his way to a Walmart store, bought a drink at its Subway restaurant and walked away again, Israel said.

While police and sheriff's deputies frantically looked for him — at least one witness at the school had identified him to arriving investigators, according to the booking affidavit — Cruz went to a McDonald's restaurant, were he lingered for a while before leaving on foot, Israel said.

It took 40 more minutes after that for Coconut Creek police to spot and detain Cruz in the nearby community of Coral Springs at about 3:40 p.m., according to the timeline Israel gave.

Contrary to some media reports that Cruz may have been wearing a gas mask or some sort of tactical or bulletproof vest, Israel said he didn't believe that was true.

Related: Football coach Aaron Feis died shielding students

Neither Israel nor the booking affidavit addressed a possible motive. Asked whether Cruz was associated with the white nationalist movement, Israel said, "It's not confirmed at this time."

Robert Lasky, special agent in charge of the FBI's Miami office, confirmed reports that the FBI's field office in Jackson, Mississippi, got a tip on Sept. 25 about a comment that had been posted to a YouTube account by someone with the username "nikolas cruz": "I'm going to be a professional school shooter."

The comment was first reported by BuzzFeed News.

Lasky said that the comment — which YouTube later removed — offered no other information and that the FBI was unable to positively identify the commenter or to establish a link to South Florida at the time.

Israel and Lasky also didn't go into detail about social media postings, presumably made by Cruz, that the FBI said it was reviewing. Israel on Wednesday described the postings only as "very disturbing."

Related: Social media changed what the public sees and hears during school shootings

Israel asked for patience Thursday, saying local, state and federal investigators had already interviewed more than 2,000 people.

"It's going to take a lot of time to sift through what was true, what was accurate and what's not," he said.

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