A Graham man went a killing spree, shooting to death his five children in their Pierce County mobile-park home before shooting himself to death with a gunshot wound to the head, authorities said Saturday.

Police said it was one of the worst mass killings in Western Washington.

A 34-year-old man apparently shot and killed his children in a mobile-home park in the Graham area of Pierce County, then drove to Auburn and killed himself, the Pierce County Sheriff’s Office said Saturday.

The children, ranging 7 to 16 years old, were found dead late Saturday afternoon after a relative saw one of the victims through a window at their home in the Deer Run mobile-home park. The 7-year-old was a boy and the girls were 11, 13, 16, 14 or 15, authorities said.

The mother, who reportedly was not at the mobile home at the time of the shooting, was being comforted by friends and relatives Saturday night, said Sheriff’s Department spokesman Ed Troyer.

The father’s body had been found Saturday morning in the 4200 block of Auburn Way South near the Muckleshoot Casino. He had apparently killed himself with a rifle, but left no note in the car, Auburn Police Sgt. Scott Near said.

A Native American man, 34, was found in his car with the engine running with a self-inflicted gunshot wound to his head, Near reported.

Auburn police said the man’s suicide occurred about 8 a.m. Saturday when children playing near an Auburn mobile home park reported that a man in a black SUV had shot himself. Their parents called police.

Relatives later identified the man as James Harrison, a diesel mechanic.

It is unclear what connection the suicide victim had with Auburn or the location where the suicide was committed, Auburn police said.

“This was not a tragedy. It was a rotten murder. Five innocent kids lost their lives,” said Pierce County Sheriff Paul Pastor.

Pierce County Sheriffs continue to investigate the “domestic violence” case.