"It has never been more important to encourage every person in every community to spot the warning signs and alert law enforcement".
The information should have been assessed as a "potential threat to life", but the proper protocols weren't followed and the Miami office was not notified, the agency explained.
On Friday, President Donald Trump visited Broward Health North Hospital, where he saw two victims and praised the doctors and nurses for their "incredible" job.
Ben Bennight, the 36-year-old YouTube video blogger from MS, noticed in September an alarming comment on a video he'd posted. The comment posted by a "Nikolas Cruz" said: "I'm going to be a professional school shooter".
Law enforcement officials have said they didn't have any evidence to support the claim that Republic of Florida leader Jordan Jereb made in interviews with several news organizations.
"The FBI's failure to take action against this killer is unacceptable", Scott said in a statement. He told reporters he also met with some of the victims who are still hospitalized.
The FBI said earlier that a person close to the shooter called the agency's tip line on January 5 to warn 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".
Cruz's attorneys at the Broward County Public Defender's Office did not return requests for comment on that or the 2016 report by Florida's Department of Children and Family Services.
Three faculty members and 14 students were killed in what is now the eighteenth school shooting since the beginning of 2018. From outside the chapel, other mourners strained to hear the voices chanting Jewish prayers and remembering the star soccer player as having "the strongest personality".
At a later funeral for 18-year-old Meadow Pollack, her father's angered boiled over. He slipped into the building, entered a stairwell and extracted a rifle from his bag, authorities said. "It is unknown what he is buying the gun for", said a report written by department officials after investigators interviewed the teenager, the Sun Sentinel said.
The sheriff clarified Friday that Cruz never had a gas mask or smoke grenades during the attack, but officers did find a balaclava. Cruz had been expelled from the high school for undisclosed disciplinary reasons and former classmates described him as an outcast and troublemaker with a fascination for weaponry. Students who knew him described a volatile teenager whose unusual behavior had caused others to end friendships.