A vehicle left the Sumner-Buckley Highway and ran into a power pole just after midnight Sunday morning between Buckley and Bonney Lake, injuring all four people inside.
Two were thrown from the vehicle in the 22700 block of the road when it hit the pole and skidded about 150 feet before landing in a ditch.
One of those patients suffered life-threatening injuries, according to East Pierce Fire & Rescue.
"Firefighters had to perform a rapid extrication of the patient when the power lines shifted and were about to fall on the patient and crew," East Pierce Acting Battalion Chief Brian Schulz said.
The other suffered "significant injures," and the two who remained in the vehicle during the crash had minor injuries, Schulz said.
All four patients were taken to the hospital.
The impact to the pole briefly cut power to the area, and the crash closed both lanes of the road for about two hours as crews responded.
Not all occupants of the vehicle were wearing seat belts, East Pierce said, based on information from Pierce County Sheriff's deputies.
Deputies were investigating the cause of the crash.
Alexis Krell: 253-597-8268