MANASSAS, Va. — A tractor-trailer overturned and dumped slabs of concrete onto the Prince William Parkway in Manassas, Va. on Thursday morning, Prince William County police said.

The eastbound lanes of the parkway at Clover Hill Road are currently closed. Police advise drivers to use caution if they're driving in the area.

What caused the tractor trailer to overturn is unknown at this time. 

Police have not reported any injuries. 

This is a developing story. We will update this when more information becomes available.

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