Six people were injured in an apparent drunk driving accident that blocked part of I-5 for several hours Sunday night.

Police say a northbound van with four people inside crashed into a guardrail and flew down an embankment on the freeway near 300th Street in Federal Way just before 8 o'clock.

The state patrol says the driver, a 35-year-old woman, was the only person inside wearing a seatbelt. She was transported to Harborview Medical Center. Three other men in the van, aged 50-53, were also injured. Two were taken to Harborview and a third was taken to Auburn General Hospital.

One of the men at Harborview fled the hospital during treatment, the patrol said, but troopers know who the man is and was working to track him down.

Another car hit the guardrail as well during the crash. Two people in that car, a mother and a baby girl, were injured. They were taken to St. Francis Hospital.

Police say they believe alcohol was a factor in the van crash.