TACOMA, WA – The Washington State Patrol is investigating after a pedestrian allegedly threw a large cement block at a passing vehicle on Interstate 705, critically injuring a passenger.

The incident occurred just after 10 p.m. on Saturday, Nov. 22, between the 9th Street on-ramp and the State Route 509 off-ramp. According to WSP, a male pedestrian threw the cement block at the vehicle, breaking through the windshield and striking the front-seat passenger.

The passenger sustained life-threatening injuries and was airlifted to Harborview Medical Center after initial treatment at a Tacoma hospital.

Detectives are seeking anyone who may have witnessed the attack or saw the suspect in or near the roadway that night.

Information can be directed to Detective Tessa Schahfer by email at tessa.schahfer@wsp.wa.gov