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(KSDK) -- Officials are investigating a triple car crash in Washington, Missouri.

It happened around 7:30 Saturday night on highway 100.

Investigators say a pick-up truck and another vehicle crashed head-on; a third car tried to avoid the wreck, and ended up on the side of the road.

Altogether, investigators say nine people were involved. One person was air-lifted to the hospital. 5 more were taken by ambulance. Three others refused medical treatment.