Authorities are searching for whoever opened fire on four vehicles on a highway in Washington state near Seattle-Tacoma International Airport on Wednesday.

The Washington State Patrol said the shootings happened in the southbound lanes of State Route 509 on the west side of the airport around 1:30 p.m., and all the vehicles were struck by bullets on the driver’s side.

No injuries were reported.

“We’re looking for an individual from the tree line area,” State Trooper Rick Johnson told Q13 Fox “We don’t believe the shots were fired from another vehicle.”

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Damage to a vehicle after it was struck by a bullet on a highway near Seattle-Tacoma International Airport on Wednesday.  (Washington State Patrol District 2 )

The shooting drew a massive response from law enforcement agencies as they searched by air and by foot to find whoever was responsible.

Authorities closed the highway in both directions for five hours, and Sea-Tac Airport shut down a runway during the investigation, though no flights were delayed or canceled.

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Authorities investigate after four vehicles were struck by gunfire on State Route 509 near Seattle-Tacoma International Airport on Wednesday.  (Washington State Patrol District 2 )

State troopers said none of the victims knew each other, and the shootings appeared to be random.

“In my recollection, I can’t remember anything like this,” Johnson said.

One of the drivers whose vehicle was shot at told Q13 FOX she was in shock after the incident.

“All of a sudden something hit my car and it was a big boom and then I realized what it was,” Mary Ertl said.  Ertl, whose car had a bullet hole in her windshield, said she quickly got off the highway to call police.

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The location where a vehicle was struck by a bullet Wednesday in Washington near Seattle-Tacoma International Airport.  (Washington State Patrol District 2 )