Dense smoke rises after an explosion at an LPS bus refueling station in Harbin city, capital of Northwest China's Heilongjiang province May 25, 2011.[Photo/CFP]

A liquefied petroleum gas (LPS) bus refueling station in Harbin city, capital of Northeast China's Heilongjiang province, exploded on Wednesday night, the China National Radio reported.

The explosion ignited one truck and six buses, but leaving no casualties, according to the local fire fighting bureau.

A resident who witnessed the accident told the media that the explosion was caused by an LPS container which then triggered a spate of explosions. As many as 16 of the 56 LPS containers at the scene exploded said local fire fighting bureau.

Following the blast, about ten divisions of firefighters and 500 policemen were sent to the station. The fire was extinguished one hour after the explosion.

The cause of the blast is still unknown.