The Washington State Patrol was continuing its search for the gunman who opened fire on several cars on Highway 509 near Sea-Tac Airport. No one was injured.

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The Washington State Patrol is looking for at least one person who opened fire on four cars driving on Highway 509 near Seattle-Tacoma International Airport Wednesday afternoon.

The shots came from a tree line east of Highway 509, and they struck four vehicles heading south, authorities said late Wednesday.

One of the bullets pierced the windshield of Mary Ertl’s car.

“I heard a boom and then glass all over my face,” Ertl told KOMO-TV on Wednesday. “I looked at the passenger side, and then I knew it was a bullet. So I slowed down, and called police.”

No injuries were reported. Authorities blocked off both northbound and southbound Highway 509 at South 160th Street and told drivers to avoid the area around 2:30 p.m.

Early reports indicated other shots were heard but were not confirmed by authorities. Additional support was provided by Renton police SWAT team and K-9 units.

Mike Luiz told KOMO a bullet went through his door and was embedded in one of the seats.

“The bullet hole is through the bottom part of the door and went into the seat,” he said.

Highway 509 was reopened to oncoming traffic around 6:25 p.m. with lane restrictions.

One lane on Highway 509 northbound was closed while the explosives detection K-9 units searched for evidence.

All lanes were reopened at 8:37 p.m. after authorities said the investigation there was complete.

The Patrol is asking the public to contact 911 for any information of  suspicious activity observed before or after the incident.