Colorado high school shooter was 'radicalized by some extremist network,' sheriff's department says

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 gunfire at Evergreen High School broke out at about 12:24 p.m. local time, according to the Jefferson County Sheriff's Office.