CHANGSHA -- A highway in Central China's Hunan province was blocked by a pileup Friday, with at least ten vehicles involved.

Casualties are not yet known. The accident struck at 9:30 am on the Hunan's Changde section of a highway linking Inner Mongolia in North China with Guangdong Province in the south.

One of the vehicles is a tanker containing phosphoric acid, according to sources with the Hunan provincial expressway management bureau.