– The 14-year-old student accused of killing four people at Apalachee High School was investigated last year for threatening to carry out a school shooting, federal authorities said. The teen allegedly made the threats online and included photos of guns, according to officials.

– Four people, two teachers and two students, were killed and nine were injured after the shooting today in Winder, Georgia.

– The teenage suspect, Colt Gray, surrendered immediately and will be charged as an adult, law enforcement officials said.

– The Georgia Bureau of Investigation identified the victims killed as Mason Schermerhorn, 14; Christian Angulo, 14; Christina Irimie, 53; and Richard Aspinwall, 39.

Authorities were notified of a problem at Apalachee High School after a security button on identification carried by teachers was pressed, the Barrow County sheriff said.

The technology is a new development, Sheriff Jud Smith said at a news conference.

The system “alarms us and alerts the law enforcement office after buttons are pressed on an ID, and it alerts us to that there is an active situation at the school for whatever reason, and that was pressed,” Smith said. “And we’ve had that for about a week now.”