CEDARHURST — An overturned tanker truck is causing significant traffic problems on two major Long Island highways.

Nassau County police say Rockaway Turnpike and the Nassau Expressway are closed in the area of Burnside Avenue where the accident occurred at 4:54 a.m. Wednesday.

Firefighters are on the scene spraying foam on the truck. It’s not immediately clear if any of the tanker fuel has leaked.

There are no immediate reports of injuries.