Officials: Fort Lauderdale airport shooting suspect Esteban Santiago said he heard voices

The suspect believed to have shot five people to death in a rampage at a Florida airport Friday was being treated in Alaska after complaining of hearing voices and had recently claimed to the FBI that the CIA was forcing him to watch ISIS videos, federal officials said.

Esteban Santiago, 26, was identified as the gunman who opened fire at a baggage claim at the Fort Lauderdale-Hollywood International Airport at 12:55 p.m., apparently shooting people at random.

Santiago had been "fighting with a lot of people," his brother, Bryan, told NBC News in a phone interview from Puerto Rico. His aunt and uncle in New Jersey said Santiago had not been the same since a 10-month deployment in Iraq with the Puerto Rico National Guard.

"Sometimes he's good. Sometimes something weird," Bryan Santiago said. "He had a woman there in Alaska, a child. He fight verbally too much with her. I can tell you he fight too much with everybody."

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Shooting at Ft. Lauderdale-Hollywood International Airport
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Shooting at Ft. Lauderdale-Hollywood International Airport
FORT LAUDERDALE, FL - JANUARY 06: Police direct traffic outside of Fort Lauderdale-Hollywood International airport after a shooting took place near the baggage claim on January 6, 2017 in Fort Lauderdale, Florida. Officials are reporting that five people wear killed and eight wounded in an attack from a single gunman. (Photo by Joe Raedle/Getty Images)

Esteban Santiago, is shown in this booking photo provided by the Broward County Sheriff's Office in Fort Lauderdale, Florida, January 7, 2017.

(Courtesy Broward County Sheriff's Office/Handout via REUTERS)

Police question people who are evacuating from Fort Lauderdale-Hollywood International Airport near the tarmac after airport shooting in Florida, U.S., January 6, 2017. REUTERS/Andrew Innerarity

Esteban Santiago, the suspect in the mass shooting at Fort Lauderdale International Airport, is transported to the Broward County Main Jail by authorities on Saturday, Jan. 7, 2017.

(Jim Rassol/Sun Sentinel/TNS via Getty Images)

FORT LAUDERDALE, FL - JANUARY 06: People wait on the tarmac of Fort Lauderdale-Hollywood International airport after a shooting took place near the baggage claim on January 6, 2017 in Fort Lauderdale, Florida. Officials are reporting that five people wear killed and eight wounded in an attack from a single gunman. (Photo by Joe Raedle/Getty Images)
Law enforcement personnel search the grounds after a shoot opened fire at a baggage carousel at Fort Lauderdale-Hollywood International Airport in Fort Lauderdale, Florida, U.S., January 6, 2017. REUTERS/Zachary Fagenson
A man is helped after airport shooting at Fort Lauderdale-Hollywood International Airport in Florida, U.S., January 6, 2017. Courtesy Mike Starobinsky/Maxwillsolutions/Handout via REUTERS ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. EDITORIAL USE ONLY. NO RESALES. NO ARCHIVE.

Airport security personnel stand in front of one of the entrances to the baggage area of Terminal 2, where yesterday a shooter killed five people and wounded six others before he was taken into custody, at the Fort Lauderdale-Hollywood International airport on January 7, 2017 in Fort Lauderdale, Florida. The alleged gunman, Esteban Santiago, 26, is reported to have flown from Alaska to Florida with a gun in a checked bag, and after landing used the gun to shoot people.

(Photo by Joe Raedle/Getty Images)

Shooting victims are unloaded from an emergency vehicle and taken into Broward Health Trauma Center Friday, Jan. 6, 2017 in Fort Lauderdale, Fla. Authorities said multiple people have died after a lone suspect opened fire at the Ft. Lauderdale-Hollywood International Airport. (Taimy Alvarez/South Florida Sun-Sentinel/TNS via Getty Images)

Broward County Sheriff officers exit from the escalator that takes people from the baggage area of Terminal 2 where yesterday a shooter killed five people and wounded six others before he was taken into custody, at the Fort Lauderdale-Hollywood International airport on January 7, 2017 in Fort Lauderdale, Florida. The alleged gunman, Esteban Santiago, 26, is reported to have flown from Alaska to Florida with a gun in a checked bag, and after landing used the gun to shoot people.

(Photo by Joe Raedle/Getty Images)

A shooting victim is unloaded from an emergency vehicle and taken into Broward Health Trauma Center Friday, Jan. 6, 2017 in Fort Lauderdale, Fla. Authorities said multiple people have died after a lone suspect opened fire at the Ft. Lauderdale-Hollywood International Airport. (Taimy Alvarez/South Florida Sun-Sentinel/TNS via Getty Images)
A shooting victim is unloaded from an emergency vehicle and taken into Broward Health Trauma Center Friday, Jan. 6, 2017 in Fort Lauderdale, Fla. Authorities said multiple people have died after a lone suspect opened fire at the Ft. Lauderdale-Hollywood International Airport. (Taimy Alvarez/South Florida Sun-Sentinel/TNS via Getty Images)
A shooting victim is unloaded from an emergency vehicle and taken into Broward Health Trauma Center Friday, Jan. 6, 2017 in Fort Lauderdale, Fla. Authorities said multiple people have died after a lone suspect opened fire at the Ft. Lauderdale-Hollywood International Airport. (Taimy Alvarez/South Florida Sun-Sentinel/TNS via Getty Images)
Travelers and airport workers are evacuated out of the terminal after airport shooting at Fort Lauderdale-Hollywood International Airport in Florida, U.S., January 6, 2017. REUTERS/Andrew Innerarity
Travelers are evacuated out of the terminal and onto the tarmac after airport shooting at Fort Lauderdale-Hollywood International Airport in Florida, U.S., January 6, 2017. REUTERS/Zachary Fagenson
Law enforcement walk outside a terminal after a shooter opened fire at a baggage carousel at Fort Lauderdale-Hollywood International Airport in Fort Lauderdale, Florida, U.S., January 6, 2017. REUTERS/Zachary Fagenson
Law enforcement personnel take cover below a stairwell in a parking garage opposite a terminal after a shooter opened fire at a baggage carousel at Fort Lauderdale-Hollywood International Airport in Fort Lauderdale, Florida, U.S., January 6, 2017. REUTERS/Zachary Fagenson
FORT LAUDERDALE, FL - JANUARY 06: Police assist people seeking cover outside of Terminal 2 at Fort Lauderdale-Hollywood International airport after a shooting took place near the baggage claim on January 6, 2017 in Fort Lauderdale, Florida. Officials are reporting that five people wear killed and eight wounded in an attack from a single gunman. (Photo by Joe Raedle/Getty Images)
FORT LAUDERDALE, FL - JANUARY 06: People seek cover on the tarmac of Fort Lauderdale-Hollywood International airport after a shooting took place near the baggage claim on January 6, 2017 in Fort Lauderdale, Florida. Officials are reporting that five people wear killed and eight wounded in an attack from a single gunman. (Photo by Joe Raedle/Getty Images)
FORT LAUDERDALE, FL - JANUARY 06: People take cover outsideTerminal 2 of Fort Lauderdale-Hollywood International airport after a shooting took place near the baggage claim on January 6, 2017 in Fort Lauderdale, Florida. Officials are reporting that five people wear killed and 8 wounded in an attack from a single gunman. (Photo by Joe Raedle/Getty Images)
FORT LAUDERDALE, FL - JANUARY 06: People take cover behind cars outside of Terminal 2 of Fort Lauderdale-Hollywood International airport after a shooting took place near the baggage claim on January 6, 2017 in Fort Lauderdale, Florida. Officials are reporting that five people wear killed and 8 wounded in an attack from a single gunman. (Photo by Joe Raedle/Getty Images)
FORT LAUDERDALE, FL - JANUARY 06: People wait on the tarmac of Fort Lauderdale-Hollywood International airport after a shooting took place near the baggage claim on January 6, 2017 in Fort Lauderdale, Florida. Officials are reporting that five people wear killed and eight wounded in an attack from a single gunman. (Photo by Joe Raedle/Getty Images)

Esteban Santiago, the suspect in the mass shooting at Fort Lauderdale International Airport, is transported to the Broward County Main Jail by authorities on Saturday, Jan. 7, 2017.

(Jim Rassol/Sun Sentinel/TNS via Getty Images)

A shooting victim is unloaded from an emergency vehicle and taken into Broward Health Trauma Center Friday, Jan. 6, 2017 in Fort Lauderdale, Fla. Authorities said multiple people have died after a lone suspect opened fire at the Ft. Lauderdale-Hollywood International Airport. (Taimy Alvarez/South Florida Sun-Sentinel/TNS via Getty Images)
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Bryan Santiago said the family had been notified recently by Alaska officials that "he had received psychological counseling in Anchorage."

Late Friday, FBI agents left the home in Anchorage where he is believed to have been living, carrying boxes of personal items.

The suspect was born in New Jersey but moved to Puerto Rico with his family and was raised there, his aunt and uncle said.

He joined the Puerto Rico National Guard in December 2007, and served in Iraq from April 2010 to February 2011 as a combat engineer, according to the Alaska National Guard.

He was in the Army Reserves before joining the Alaska National Guard two years ago and got a general discharge Aug. 16, 2016, for unsatisfactory performance, a spokesman for the Alaska guard said. He was a private first class when he was discharged, the Guard said.

Witnesses said the gunman shot his victims at random until he ran out of bullets, then got on the ground and waited for police.

In November, Santiago walked into the FBI's office in Anchorage and claimed his mind was being controlled by a U.S. intelligence agency and the CIA was forcing him to watch ISIS videos, federal law enforcement officials told NBC News.

Santiago was clear that he didn't intend to harm anyone, but the FBI was concerned by his erratic behavior and called police and he was taken to a mental health facility for an evaluation, FBI Special Agent in Charge George Piro of the Miami division told reporters Friday night.

"We looked at his contacts, we did our interagency checks and everything and at that point we closed our assessment," Piro said.

Bryan Santiago, who lives with his mother in Puerto Rico, said he did not know whether his brother had been diagnosed with PTSD, post-traumatic stress disorder, and did not know why his brother left the Alaska National Guard.

"We were talking to him like three weeks ago," he said.

But the conversation did not go well. "Just arguing," Bryan Santiago said, when asked to explain.

After that, the family did not hear from Santiago again, which was unusual.

"We are very worried here," he said. "Why he did not call us."

Witnesses capture the chaos at the scene:

Police said Santiago took off from Anchorage and arrived at Fort Lauderdale-Hollywood International Airport on Friday on a connecting flight from Minnesota. At the baggage claim, they said, Santiago retrieved a weapon and began shooting.

Why remains a mystery.

Santiago's brother said they have family in Florida but had no idea why he was there — or why he allegedly went on a shooting spree.

"He is a regular person, spiritual, a good person," Bryan Santiago said.

Santiago's aunt and uncle in Union City, New Jersey, said Santiago was the father of a son named Pierre and that the boy and his mother both live in Puerto Rico. They, too, had no explanation for the shooting, but suspected it might have been related to his war experience.

"When he came back from Iraq, he wasn't feeling good," Hernan Rivera told NBC News. Santiago's aunt, Maria Luisa Ruiz, said they were told that he "got a little sick" around December, started to hear things, and was in treatment.

Santiago was born in Hamilton, New Jersey, and raised in Peñuelas, Puerto Rico, where his mother still lives. His father died four years ago.

Six years ago, Santiago enlisted in the Puerto Rico National Guard, his brother said.

"He was pro-America," Bryan Santiago said.

Two years ago, Santiago moved to Alaska, where he lived with a woman and a child and where he worked as a security guard, his brother said. He also owned a handgun.

In January of 2016 he was charged in with criminal mischief and a misdemeanor count of assault after he allegedly broke open the door of a bathroom and yelled and choked his girlfriend, according to police records. The case was dismissed in March, according to online records. A call to an attorney listed as representing Santiago was not immediately returned.

Santiago was not harmed during his arrest after the shooting in Florida, and no law enforcement officers fired any shots, Broward County Sheriff Scott Israel said. Investigators believe he acted alone, Israel said.

FBI Special Agent in Charge George Piro of the Miami division said Friday night that investigators are not aware of any incident that occurred on the flight or in the baggage claim area before Santiago opened fire.

See how social media responded to the incident:

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Reactions to incident at Fort Lauderdale-Hollywood International Airport
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Reactions to incident at Fort Lauderdale-Hollywood International Airport
#breaking reports of shots fired at FLL Live pics from #chopper4 @CBSMiami https://t.co/PkZBiERKo9
>@MxWllSolutions has tweeted a photo of a victim at the FLL airport. "Guy is bleeding profusely."
Yikes, look at this breaking news text I just got... I'm sure this will be all over the news soon... #FLL… https://t.co/zg8wbLGmby
Hope it's inaccurate or wrong but apparently there's a mass shooting at FLL airport, please be safe... prayers for the victims 🙏
NBC NEWS: 9 people shot, 1 dead at Fort Lauderdale-Hollywood International Airport; shooter is in custody, law enforcement sources say
.@WPLGLocal10 is working to confirm these tweets by former WH Press Secretary @AriFleischer of a shooting at… https://t.co/6JmUfkrI7b
I'm stuck on the FLL airport tarmac in terminal 2 and there's a roadblock on I-95. Apparently there was a shooting… https://t.co/vbnZRSMqz6
I'm at the Ft. Lauderdale Airport. Shots have been fired. Everyone is running.
#BREAKING Suspect in custody after shooting at Ft. Lauderdale Airport https://t.co/XjP9GAV2WU https://t.co/XVCWPP2GvX
Tragic news out of Florida today, with news of an airport shooting. We're 6 days into 2017 and this is our 6th ma… https://t.co/PnqUMkRLKQ
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