BELLINGHAM, Wash. (AP) — Authorities say an SUV struck four teenagers while they were walking as part of a school physical education exercise, killing two of them and seriously injuring two others.

State Trooper Mark Francis said the Windward High School students were on a sidewalk Wednesday afternoon north of Bellingham when the SUV left the road and hit them from behind.

Francis says 18-year-old Shane Ormiston and 15-year-old Gabriel Anderson were killed. Two 17-year-olds — Michael Brewster and Kole Randall — were injured.

St. Joseph Medical Center in Bellingham said Brewster was being transferred to Harborview Medical Center in Seattle. The other boy is in serious condition.

The trooper says the 34-year-old driver initially said he fell asleep, but later told a patrol drug recognition expert he had used drugs. Francis would not say what drugs were mentioned.

Francis said William Klein of Bellingham was arrested for investigation of vehicular homicide and vehicular assault.

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