Authorities investigating a deadly shooting at a Washington state high school say a cafeteria worker attempted to stop the gunman.

Snohomish County Sheriff's spokeswoman Shari Ireton said in a statement Saturday morning that the on-scene investigation at Marysville-Pilchuck High School north of Seattle was finished. A .40-caliber handgun was recovered. Ireton says it is believed that was the weapon used in the Friday morning shooting that left one girl dead.

Authorities say the gunman — a popular freshman at the school — fatally shot himself. Four other young people were badly wounded. Ireton says two other students were treated at the high school for minor wounds

Detectives confirmed the cafeteria worker attempted to intervene in shooting, but Ireton provided no other details about the worker's actions.