A 16-year-old student -- who authorities say opened fire at his Colorado high school on Wednesday, wounding two classmates and then turning the gun on himself -- was believed to be "radicalized by some extremist network,” officials with the local sheriff's office said.

Investigators said the shooter who shot and injured two students at Evergreen High School on Wednesday kept shooting and reloading, according to the Jefferson County Sheriff's Office, and that much of the credit for saving lives goes to the students and staff.

The boy who shot two schoolmates and himself at Evergreen High School was identified Thursday as 16-year-old Desmond Holly.