"Victory at Beiji is a crucial step toward ending Daesh's presence in Iraq," Haider al-Abadi told military and militia commanders during a visit to the area the day before, using an Arabic acronym for the IS group.
The military retook the town of Beiji from the extremists in November, but government forces and allied Shiite militiamen there have come under mounting pressure in recent weeks. Militants now control up to half of the town and oil refinery to the north, a top commander told The Associated Press.
"Daesh wants to punch a hole there so our situation, not just in Beiji, but in the entire area, becomes untenable. The collapse (of Iraqi forces) that the enemy wanted did not happen," he said in remarks aired by state television.
"Beiji has become a key front for the defense of Samarra, Salahuddin (province) and even Baghdad," he said.
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Samarra is home to an important Shiite shrine that was bombed by suspected Sunni extremists in 2006, triggering widespread sectarian violence that claimed tens of thousands of lives.
Elsewhere in Iraq, a suicide bomber in an explosives-laden army vehicle drove into a group of soldiers and Sunni militiamen southeast of the IS-held city of Ramadi, the provincial capital of the vast Anbar province west of Baghdad, killing 13 and injuring seven, according to security officials. Today's attack came four days after up to 50 soldiers were killed in two separate ambushes, also near Ramadi.
A major in the Interior Ministry's intelligence agency was killed today in a similar attack in northern Baghdad, according to the officials. It was not immediately clear who killed him.