EVERGREEN — At least 3 teens, including a suspected shooter, were in critical condition Wednesday afternoon at a Denver-area hospital following a shooting at Evergreen High School in the Jefferson County foothills, officials said.

Hundreds of police and law enforcement officers responded to the school at 29300 Buffalo Park Road after a 911 caller reported an active shooting at 12:24 p.m., Jefferson County Sheriff's Office spokesperson Jacki Kelley said at a briefing Wednesday afternoon.

It's not clear whether the suspected shooter was struck by police or shot themself, Kelley said. The juvenile suspect is believed to be a student at the school, but no additional information about their identity was available.

There is no ongoing threat to the community, Kelley said.

"This is the scariest thing that could ever happen, and these parents were really frightened, and so were the kids," Kelley said. "And I know we say 'never again,' and here we are."

It's not clear whether the shooting started inside or outside the school, but investigators have found at least one area outside the building where the shooting happened, Kelley said.