The investigation is ongoing, and detectives are waiting on laboratory test results. No arrests have been made, city spokeswoman Kristin Banfield said.
The crash happened about 3:15 p.m. near the intersection of 172nd Street NE and 51st Avenue NE. Emergency crews had to close the road for several hours.
Detectives believe that a 2006 GMC pickup and a 1992 Ford Probe collided, Banfield said. A woman in the Ford was seriously injured and had to be cut out from the vehicle.
The two drivers and a passenger in the truck also were hospitalized. None of their injuries were believed to be life-threatening.
The Snohomish County sheriff's Collision Investigation Unit was called out to assist with the case.
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