A fire has engulfed a refinery belonging to state-owned oil giant PetroChina in northeast China, the official Xinhua news agency reported on Monday.
The blaze broke out at PetroChina's Dalian refinery at around 10:00 am (0200 GMT), Xinhua reported in a short dispatch, giving no details of any casualties.
Photographs on local news websites showed the refinery in flames and Xinhua quoted local people as saying the air was filled with smoke and traffic was blocked as fire engines rushed to the scene.
Telephone calls to the plant and to local authorities went unanswered.
The fire comes after more than 30 people were injured when an explosion ripped through a PetroChina oil refinery in neighbouring Fushun city in January.