Smoke and fire are seen after a fire at a China National Petroleum Corporation (CNPC) plant in Dalian, Liaoning province, Aug 29, 2011. [Photo/Xinhua]

A fire erupted at a China National Petroleum Corporation (CNPC) plant in Dalian, Northeast China's Liaoning province at around 10 am on Monday, Xinhua reported.

A statement on the CNPC's official website confirmed the incident, saying a tank containing about 800 tons of diesel oil is on fire.

The statement said: "The cause of the blaze is being investigated. No one was injured and no oil spilled into the sea."

The CNPC refinery in Dalian also caught fire in July.

Related Story: CNPC Dalian plant fire contained

Smoke and fire are seen after a fire at a China National Petroleum Corporation (CNPC) plant in Dalian, Liaoning province, Aug 29, 2011. [Photo/Xinhua]