A fire has broken out at the onshore Kalamkas oil field in Kazakhstan’s western Mangistau province, the country’s emergencies committee said March 25.

MangistauMunaiGas (MMG), the company which operates the field and is owned by Kazakh state energy firm KazMunayGaz and China’s CNPC, could not be reached for comment.

KazMunayGaz said it would comment on the incident and its impact on oil output on March 26.

Videos posted by area locals online showed raging fire, which broke out at one of Kalamkas wells before dawn, rising about 10 m from the ground.

MMG produced 6.4 million tonnes of oil last year—about 7% of Kazakhstan’s total output—and Kalamkas, its biggest field, has traditionally accounted for more than 60% of the company’s production.

The company mostly ships oil for exports through pipelines to Russian seaports, but also sends small amounts by another pipeline to China.