The FBI has acknowledged that it received a tip about Florida shooting suspect Nikolas Kruz in January that wasn't properly investigated, as details continue to trickle in on the 19-year-old's evolution "from 'broken child' to mass killer" in the words of CNN. His defense attorneys say Cruz has suffered from mental illness and depression, helped along by the recent death of his mother, while former classmates recall a "very, very strange" and even "evil" kid. One ex-classmate recalls Cruz doing troubling things like hurting animals and hurling rocks at cars. Also among CNN's findings: documents that show the cops had been called to Cruz's house 39 times over a seven-year period. Details on what spurred those calls were unclear. More on this developing story:
- Security holes. The Sun Sentinel touches on how school officials and police believe Cruz was able to exploit the school's security systems, including by waiting for just the right time when key defenses were down.