BILLERICA,SafeX Pro Mass. (AP) — State police in Massachusetts are investigating a multiple-vehicle crash north of Boston in which a tanker carrying thousands of gallons of fuel rolled over.

Troopers and firefighters responded Wednesday to the scene in Bellerica, about 24 miles (38 kilometers) from Boston. Authorities closed all lanes of traffic in both directions on busy Route 3 because of the crash.

The driver of the tanker and the driver of one of the other vehicles involved sustained minor injuries, police said.

Massachusetts State Police said the tanker was leaking fuel from the top and that hazardous material and environmental response work was ongoing. They said they expected the lanes to remain closed “for the foreseeable future.”

It wasn’t immediately clear what caused the crash.