CNN - Two 14-year-old students and two teachers were killed in a mass shooting at Apalachee High School in Winder, Georgia. Nine other people — eight students and one teacher — were wounded and hospitalized, all of whom are expected to survive.

The suspect, a 14-year-old student at the school, and his father were questioned by law enforcement last year regarding “anonymous tips about online threats to commit a school shooting,” according to FBI Atlanta and the Jackson County Sheriff’s Office. At that time, there was no probable cause for arrest.

The gun used in Wednesday’s shooting was an AR-platform weapon, according to the Georgia Bureau of Investigation director. A law enforcement official told CNN earlier it was an AR-15-style rifle.

The shooting is at least the 45th school shooting in 2024 and the deadliest this year, according to a CNN analysis.