A bridge crossing the Skagit River in Northwest Washington State collapsed on Thursday, sending three vehicles into the river and injuring three people.

According to a report from Seattle’s local Fox affiliate, a bridge along I-5 about 60 miles north of Seattle collapsed, sending vehicles into the Skagit River 50 feet blow. People in those vehicles were reported to have climbed on top of their cars to stay out of the water. The injured persons are all reported to have survived with only minor injuries.

A Washington State Department of Transportation (WSDOT) cited witnesses as saying the cause of the bridge collapse was an oversized load truck that struck the bridge, though the official cause of the collapse is still under investigation. The department has closed both directions of traffic on the I-5 in Skagit County, and is advising locals on possible detour routes. The National Transportation Safety Board will also be investigating the collapse, after which the WSDOT will remove the broken bridge and replace it.

(Image courtesy the Washington State Department of Transportation)