ALGER A shooting rampage on Tuesday afternoon in northwest Washington has left six people dead, including a sheriffs 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 sheriffs 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.

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.

The wounded included a motorcyclist who was shot in the arm at a gas station in Alger and the trooper hit as the suspect raced along I-5.

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

The civilian motorist was shot and killed and the unidentified trooper was grazed by a bullet along I-5 near a rest stop, Leary said. The trooper was treated for non-life-threatening injuries.

The victims were not immediately identified.

The first shootings were reported shortly after 2 p.m. Tuesday and the suspect was in custody by about 430 p.m.

State Patrol troopers temporarily closed all southbound lanes of I-5 north of Burlington for a period Tuesday evening, backing up traffic for miles, as they investigated that crime scene.