Chunli Zhao is accused of killing seven people in the coastal community south of San Francisco.
The school's district superintendent was ousted from his post after the revelations about the warnings came to light.
The delay is throwing a spotlight on the nation's flawed system for warnings of mass shooters at large.
Officers arrested a suspect in Monday’s shootings, 67-year-old Chunli Zhao, after they allegedly found him in his car in the parking lot of a sheriff’s substation.
A teacher was also injured in the shooting at Starts Right Here, an educational program affiliated with the Des Moines, Iowa, school district.
After years of stalled progress -- and shootings -- laws designed to reduce gun violence finally have a chance.
The St. Lucie County Sheriff’s Office confirmed all the victims in the early evening shooting in Fort Pierce were adults, WPBF-TV reported.
Karon Blake was fatally shot on Jan. 7 by a government employee, according to police reports.
“I look back on some films that I’ve made, and I don’t know if I would want to...fetishize the gun, like I did on a couple of 'Terminator' movies," said Cameron.
“We must put an end to these unspeakable tragedies and rid our communities of gun violence," tweeted Illinois Gov. J.B. Pritzker.