Three policemen were killed in a suicide attack south of Mosul, the northern Iraqi city where ISIS is fighting off a US-backed offensive, the Daily Mail quoted security sources as saying on Monday.
A group of about 10 assailants, including four suicide bombers, had tried to infiltrate a Federal Police helicopter base in Al-Areej, a police captain said.
Three policemen and three of the assailants were killed in the attack, he said. Police gave chase but the assailants managed to escape, he said.
Al-Areej is located just south of Mosul where some districts remain under control of the hardline Sunni group.
ISIS is now besieged in the northwestern part of Mosul, an area that includes the Old City. Its Grand al-Nuri Mosque is where the group's leader, Abu Bakr al-Baghdadi, declared a "caliphate" over parts of Iraq and Syria in mid-2014.