The FBI has also separately been criticized by some Republicans over its investigation of allegations of Russian meddling in the 2016 presidential election, heaping further scrutiny on the agency led by Wray since President Donald Trump fired James Comey last year.
The FBI on Thursday said they had conducted "checks" at the time, but were unable to identify the person behind the comment. Another post on the page is a view down the barrel of a gun with a holographic sight out a window onto the street.
"We will make this a top priority".
"He unlocked the door and let us in", Friend said. "All of us will be forever changed".
Cruz was arrested in Coral Springs, a neighbouring city a few kilometres from the school, about an hour after fleeing the scene, said the authorities.
"Seventeen innocent people are dead and acknowledging a mistake isn't going to cut it", Scott said.
On Friday, the FBI issued a statement saying it had received a report on January 5 concerning the shooter, 42 days before the mass shooting. The information should have been assessed as a "potential threat to life", the bureau said.
"Him coming here is absolutely absurd, and he's a hypocrite", Mark Bogen told CNN in an interview following Mr Trump's tweet. About 100 of the tips are considered "actionable". "We see the tragic consequences of those failures", Sessions said in a statement.
Wayne LaPierre, the executive vice president of the National Rifle Association, speaks at the Conservative Political Action Conference in Oxon Hill, Maryland last February.
However, despite the FBI receiving two reports that Cruz was threatening a school shooting online, the teen was never placed on a watchlist.
Meanwhile, state Sens. Anitere Flores, R-Miami and Rene Garcia, R-Hialeah, are asking Senate President Joe Negron to convene a task force on shoring up school safety. "I really don't think there's anything new to say, but there shouldn't have to be", she responded.
Rebecca Bogart, 17, said her teacher was finishing up a discussion of the Holocaust when she heard a series of loud bangs.
"We truly regret any additional pain this has caused", he said.
What do we know about the suspect?
Fred Guttenberg, whose daughter Jaime Guttenberg was killed, spoke at the vigil.
"This is not a case for lawyer games". I am safe, ' [and] they both responded with, 'OMG, ' 'LOL, ' 'You're funny.' Now that's a problem in society and it's a bigger problem in America, and it needs to be fixed.