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 much of the credit for saving lives goes to the students and staff.

One teenager remains in critical condition Thursday after an unidentified student shot two of his classmates at Evergreen High School in Jefferson County before shooting himself.

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.

The Colorado high school shooting suspect, who was identified as a 16-year-old student, was believed to be "radicalized by some extremist network,” officials said.