Report: Jonathan Martin in custody following alleged threat against former school

Harvard-Westlake High School in Los Angeles was closed on Friday after the prep school learned of an online threat from an alum, believed to be former Miami Dolphins offensive lineman Jonathan Martin.

A former Harvard-Westlake student made an indirect threat on Instagram, seeking revenge as a bully victim, police told multiplemediaoutlets in Los Angeles. Officials reportedly sent an alert around 7 a.m. warning students of a “security risk” and closing the school’s two campuses in the city on Friday.

That student was identified as Martin by 12up.com’s Nick Brown. Brown shared a screen grab of Martin’s verified Instagram account that shows the disturbing image of a gun, surrounded by bullets, with the caption, “When you’re a bully victim & a coward, your options are suicide, or revenge.”

According to ABC News producer Matt Stone, Martin was taken into custody on Friday:

Martin was the subject of a much-publicized bullying incident during his second and final season with Miami in 2013. An NFL investigation determined that Dolphins teammates Richie Incognito, Mike Pouncey and John Jerry subjected Martin to “a pattern of harassment” in “a classic case of bullying.”

Incognito, Pouncey and two former Harvard-Westlake classmates were tagged in the screen grab of Martin’s Instagram story. The hashtags “HarvardWestlake and #MiamiDolphins were added to the gun.

“Last evening, we learned of an Internet post that mentions Harvard-Westlake by name,” school officials said in a statement on Friday, via KTLA. “Out of abundance of caution, and because the safety of our students, faculty, and staff is our top priority, we made the decision to close school today. We are working closely with law enforcement and will share more information when we are able.”

A former second-round pick out of Stanford, Martin did not play for the Dolphins after news of the bullying allegations went public. He played 15 games for the San Francisco 49ers the following season, starting seven of them, and was claimed off waivers by the Carolina Panthers in March 2015. He retired from the NFL at age 24 that summer, citing a back injury that would have cost him the 2015 season.

The NFL published a 144-page report from attorney Ted Wells, which included a series of distressing text messages from Martin to his parents alleging bullying throughout middle and high school, at Stanford and in Miami. He told his parents he suffered from anxiety and “really severe depression.” Martin wrote in 2013, “A therapist and medication won’t help me gain the respect of my teammates.”

Following his retirement from football, Martin wrote on Facebook that he attempted suicide on multiple occasions. “You let your demons go,” Martin shared upon retiring, “knowing that, perhaps, sharing your story can help some other chubby, goofy, socially-isolated, sensitive kid getting bullied in America who feels like no one in the world cares about them.” In recent years, Martin has spoken to schoolchildren about his experiences with bullying and depression on behalf of Beyond Differences.

Martin’s disturbing Instagram post comes a week after 17 students were killed in a mass shooting at Stoneman Douglas High School in Parkland, Fla., just 33 miles from the home of the Miami Dolphins.

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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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Ben Rohrbach is a writer for Yahoo Sports. Have a tip? Email him at rohrbach_ben@yahoo.com or follow him on Twitter!

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