Two people were killed in the collision involving two semitrucks and six passenger vehicles on Snoqualmie Pass. The westbound portion of Interstate 90 near the crash was closed for several hours Friday.

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Update, 5 p.m. Saturday: The Washington State Patrol has released the names of two people killed Friday: Richard Slightam, 49, and Carmen Lang, 50, both of Ronald, Kittitas County, who were driving west in a Volvo sedan when the truck swept across the road.

The driver of a semitruck has been arrested on suspicion of vehicular homicide after a crash that killed two people early Friday on westbound Interstate 90 near Snoqualmie Pass.

The Washington State Patrol said the driver of the car hauler lost control of the truck and veered across the roadway. The driver is suspected of being under the influence of drugs, the State Patrol said in a news release.

The collision involved two semitrucks and six passenger vehicles.

Five people were transported to the hospital after the crash, but none of their injuries appeared life-threatening, said Trooper Chris Webb.

The State Patrol closed Interstate 90 near Easton to westbound traffic for much of the day as investigators mapped and measured the complicated collision scene to determine who was driving the vehicles and to clear the wreck, Webb said. The section of highway was reopened shortly after 3 p.m., according to the state Department of Transportation.

Webb said the two people killed were in the same car but didn’t have any more information about them or others injured in the crash.