Details emerge in Evergreen High School shooting, but motive still unclear

• In total, three students were shot — the two victims and the suspect. Authorities said earlier reports of a fourth injured person were incorrect.

Zoom in: The shooting, which began just before 12:30pm Wednesday, took place on campus but spilled onto a nearby street, where one victim was shot. Authorities first stated the attack was contained on school grounds.

• Investigators say Holly was "radicalized through an extremist network," though his exact motive remains unclear.
• The suspect used a revolver, repeatedly firing and reloading as he sought new targets, Kelley said Thursday. She attributed sealed doors during the school's lockdown to preventing the suspect from reaching more students.

State of play: Investigators are still working to determine whether Holly's attack was targeted or random.

• Authorities are also working to trace the gun's ownership.

Between the lines: Evergreen High School's full-time school resource officer was on medical leave, and the part-time replacement had left campus around 10:45am to respond to a nearby accident — leaving no officer on site when the attack began.

Zoom out: Evergreen High School will be closed the rest of the week, Jefferson County Public Schools announced. Classes were canceled Thursday for eight other Jefferson County-area schools.

What we're watching: The investigation now turns to how a 16-year-old accessed a revolver, what drove him to open fire on his schoolmates and what — if anything — could have prevented the shooting.