The crash happened just after noon near the West Seattle Freeway offramp as a heavy rain shower blew through the area. The semi truck came from West Seattle and merged onto I-5 south, but he lost control and struck two cars and the bus, said Trooper Chris Webb. The truck was not carrying a trailer.
Originally Seattle fire officials said seven were hurt but updated that tally to six injured Thursday afternoon. All six were taken to Harborview Medical Center in Seattle, mainly complaining of neck and back pain, officials said. Three of those hurt, including the critically injured patient, were on the charter bus, fire officials said. The driver of the semi truck and two people in another car were also taken to Harborview.
A spokesman for Airporter Shuttle says their bus was traveling in the HOV lane when it was struck by the semi. The agency was working on getting alternate transportation to get its passengers to the airport.
One bus passenger, Kelsey Green, told KOMO News she was shaken up but not injured in the crash.
"I was reading, and then everyone said, 'Hold on! Hold on!' and then I looked up, and then I slammed into the semi," she said.
Two left lanes are blocked for much of the early afternoon, contributing to a traffic backup that extended well into North Seattle.