An official says hundreds of villagers in central Vietnam blocked traffic on the country's main artery for hours to protest pollution from a coal-fired thermo power plant.

Local official Nguyen Thanh Sang in Binh Thuan province said Thursday that the villagers threw rocks, bricks and gasoline bombs at riot police who were trying to direct traffic Wednesday night. About 10 policemen were injured.

Sang says the 500 protesters left after authorities said their concerns will be addressed, adding traffic on Highway 1 was running early Thursday morning.

Sang quoted the villagers as saying they blocked traffic to get attention from the central government after repeated demands in the past were not met.

The Vinh Tan 2 power plant went into operation a year ago.