Washington ? A shooting rampage Tuesday afternoon in northwest Washington has left six people dead, including a sheriff’s deputy, the State Patrol said. A suspect in the shootings has surrendered.

Two people were wounded during the violence in Skagit County, including a state trooper who reportedly was grazed in the arm by a bullet.

A man was arrested after turning himself in at the Skagit County sheriff’s office in Mount Vernon, Trooper Keith Leary said. The man was not immediately identified but Leary said he is known to authorities as “someone with a mental illness.” State Department of Corrections officials are “99 percent sure” the man is a 28-year-old with a lengthy criminal record, spokesman Chad Lewis said.

The dead were found at multiple crime scenes. They included the deputy shot while responding to a call and a second person killed at the same location near the small town of Alger; two construction workers found shot nearby, and a third body found a few houses away, Leary said. Authorities were investigating any connection among those sites.

A motorist was shot and killed on Interstate 5 as the suspect fled south.

After the shootings in the Alger area, the armed man raced south on Interstate 5 at speeds in excess of 90 mph, with troopers, sheriff’s deputies and Mount Vernon police in pursuit, Leary said.