The Iraqi Oil Ministry said firefighters have put out fire at an oil well near the town of Qayyara, New China informed.

“The technical teams of the [Iraqi government-owned] North Oil Company, civil defense, and military engineers have managed to extinguish fire at the well No. 70 in Qayyara oilfield in Iraq’s northern province of Nineveh,” the ministry said in a statement.

The firefighters have also managed to put out fire at other 20 oil wells south of Mosul.

Meanwhile, five additional oil wells are still burning out of 25 that Islamic State set on fire in Qayyara, Reuters reported. North Oil Company’s crews are working to control the fires torched by the militants to slow down the advance of US-backed Iraqi forces toward Mosul, their last major city stronghold in Iraq.

The oil field was one of the main sources of revenue for the group that declared in 2014 a self-styled ”caliphate” in parts of Syria and Iraq.