The Islamic State group has killed 15 members of the local security forces in attacks on villages in northern Iraq, officials said on Friday. The attack was launched late Thursday on villages east of the restive town of Tuz Khurmatu, which lies in an ethnically mixed area 160 kilometres (100 miles) north of Baghdad. The ensuing clashes killed 15 members of the police, of a Turkmen paramilitary organisation and of the Kurdish peshmerga.