Three people were killed and eight others injured in a van crash Wednesday afternoon near Kennett Square in Chester County, the state police said.

The accident occurred just before 2:30 p.m. on southbound U.S. Route 1 north of Newark Road in New Garden Township, the Pennsylvania State Police said.

There were 11 people in the vehicle carrying workers for a temp firm under contract to Herr’s Food Inc. when the vehicle went off the road in the rain and overturned, officials said. The state police said occupants had been ejected from the van or were trapped in it when they responded to the scene.

Some of the injured were taken to trauma centers at Christiana Hospital in Newark, Del., and Crozer Chester Medical Center, officials said.

U.S. Route 1 south was closed for several hours after the crash.

The cause of the accident was under investigation.