Updated at 10:35 p.m. ET
The FBI says that someone called its tip line to report concerns about Nikolas Cruz, who has told police he killed 17 people in a Florida high school this week — but that the bureau failed to follow protocols to assess the threat.
The bureau says a person close to Cruz contacted the FBI's Public Access Line on Jan. 5 to report concerns about him. Those concerns included information about Cruz's gun ownership, a desire to kill people, erratic behavior and disturbing social media posts.