MARYSVILLE, Wash. — Jaylen Fryberg was well liked and athletic, a football player named to his high school’s homecoming court just one week ago.

He was also facing problems, writing of some unspecified troubles on his Twitter feed: “It breaks me… It actually does….”

The popular Marysville-Pilchuck High School freshman opened fire in the school’s cafeteria late Friday morning, a government official with direct knowledge of the shooting told The Associated Press.

One girl was killed and four other young people — including two of the gunman’s cousins — were badly wounded before Fryberg fatally shot himself, witnesses, police and relatives said.

His motives remained unclear.