The FBI’s director is facing calls to resign over its failure to investigate a warning about Florida gunman Nikolas Cruz, six weeks before the school massacre in which 17 people were killed.
A person close to Cruz called the FBI with information on 5 January that should have been deemed a “potential threat to life” but was not passed on, the agency said.
“The caller provided information about Cruz’s gun ownership, desire to kill people, erratic behaviour, and disturbing social media posts, as well as the potential of him conducting a school shooting,” the FBI said.
Florida Governor Rick Scott said the FBI’s failure to take action was “unacceptable” and called for its director Christopher Wray to step down.
“Seventeen innocent people are dead and acknowledging a mistake isn’t going to cut it,” Governor Scott said.
“An apology will never bring these 17 Floridians back to life or comfort the families who are in pain.”
Mr Wray said: “We have spoken with victims and families, and deeply regret the additional pain this causes all those affected by this horrific tragedy.”
:: Pictured: 17 victims gunned down in school massacre
US Attorney General Jeff Sessions has ordered a review into the FBI’s procedures, saying it was clear “warning signs” were missed.
It comes after Ben Bennight said he told the FBI in September about a comment on YouTube under Cruz’s name which read: “I’m going to be a professional school shooter.”
Funerals were held on Friday for two teenagers killed in the Valentine’s Day shooting at Marjory Stoneman Douglas High School in Parkland.
Mourners broke down in tears as services were held for 14-year-old Alyssa Alhadeff and Meadow Pollack, 18.
The grief and anger of Meadow’s father Andrew Pollack boiled over at her funeral as he yelled: “You killed my kid!”
“My kid is dead,” he said.
“This is just unimaginable that I will never see my princess again.”
Donald Trump said on Friday he was travelling to Florida amid calls from survivors for action to tackle gun violence.
The US president tweeted: “I will be leaving for Florida today to meet with some of the bravest people on Earth – but people whose lives have been totally shattered.”
In a direct message to Mr Trump, student David Hogg, who survived the massacre, told Sky News: “Don’t let this be another mass shooting. This is an event that needs to be a turning point and it’s an event nobody should have to go through.
“You can make as many promises as you want. But promises without action are simply lies.”
Cruz, who admitted to police that he carried out the shootings, reportedly said he heard voices in his head telling him how to carry out the massacre.
The voices were described as “demons” by police sources, according to ABC News.
It was also reported that Cruz, who is in custody over the killings, “excelled” in an air-rifle marksmanship programme supported by funding from the National Rifle Association Foundation.
The grant was part of a multi-million dollar effort by the pro-gun group to support youth shooting clubs.
Seven people remain in hospital following America’s second deadliest ever school shooting.