Police later said they suspect that the driver of the Tahoe, a man in his 20s, was impaired at the time of the crash, and they are applying for a search warrant to take a blood sample.
A passenger in the Tahoe was seriously injured, and the driver sustained minor injuries. Two students and a driver on the bus sustained minor injuries.
Police and medics responded to the scene, the 11000 block of South Lake Stevens Road, at about 6:45 a.m. after receiving a report of a serious crash involving a bus.
Arriving there, they found that a Chevy Tahoe had crossed into the oncoming lanes and crashed head-on into the school bus, said Dennis Taylor of the Lake Stevens Police.
Two Cavelero Mid High School eighth-grade students and a driver aboard the school bus sustained minor injuries. The driver was taken to the hospital as a precaution. The students were treated at the scene, said Jayme Taylor, director of communications for the Lake Stevens School District.
"It sounds like some teeth went through lips, so lots of blood, but the students are very calm and just being checked out," Taylor said. "It's as calm as can be under the circumstances. Obviously a big mess with the debris and gasoline, but everyone's doing what they should be doing and staying calm."
The driver and a passenger in the SUV were extricated and taken to Providence Hospital in Everett for treatment of their injuries.
Taylor said evidence found at the crash scene suggests the driver of the Tahoe was impaired.