But Brig Gen Saad Maan, a spokesman for the Interior Ministry, denied during his appearance on state television that the Islamic State group had taken over major parts of the refinery, the country's largest, as some Iraqi media reported.
Aside from its commercial significance, Beiji is on the road to Mosul, Iraq's second largest city and the main center of the Islamic State's power in Iraq. If Iraqi forces hope to eventually take back Mosul, they have to secure Beiji the scene of stubborn fighting for months.
The government has several times said the refinery was under control, but militants have repeatedly counterattacked.
A spokesman for the provincial government, Adel al-Samaraie, said militants are in control of at least half the refinery and are seeking to cut the main supply line to the embattled troops holding the rest.
"They are advancing and taking over many areas," al-Samaraie told The Associated Press in a phone interview, referring to the militants.
In recent days, the Iraqi government has decried what it describes as a propaganda war by the Islamic State to exaggerate their advances. The extremist group, which has taken large parts of the north and west of the country, has issued statements online that it has control of most of the refinery.
The Iraqi government said today that a joint force of federal police and militias, known as popular mobilization units, are working to clear the road to the refinery. Beiji is north of Tikrit, which was retaken by Iraqi forces last month. Reflecting the intensity of the fighting in the area, eight of the 22 airstrikes carried out today by US-led coalition forces against the Islamic State were around Beiji.
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