Florida ? A van carrying 19 workers from a Florida orange grove flipped over on an interstate highway Thursday, killing seven men who were ejected from the vehicle, state police said.

Six died at the scene and the seventh died at a hospital, Florida Highway Patrol Lt. Tim Frith said. Twelve others who were injured were taken to area hospitals.

According to police, the men — all workers for the Circle H Citrus Co. — had left an orange grove in the town of Sebastian, 27 miles north of Fort Pierce.

Witnesses said the Ford cargo van was swerving in its lane and then crossed into the grassy median and rolled over four times, Frith said.

“It appeared that the driver was moving in the lane as if he was distracted for some reason,” Frith said, describing what witnesses told police. “It’s a very heart-wrenching accident.”

The van had four bench seats, along with single seats for a driver and passenger, Frith said. Troopers were investigating whether the van was over its capacity.