Islamic State militants pushed through a gap in the Iraqi army frontline on Thursday to capture a northern village, local sources said, demonstrating the group's continued reach after a major defeat in the west.
The dawn attacks on Tal Kusaiba, around 35 km (20 miles) east of Tikrit, killed the police station chief and five Shi'ite militia fighters, police and tribal sources in nearby Alam said.
Pro-government forces have been pushing north along the Tigris River for nearly a year, retaking Tikrit from Islamic State fighters in April and then driving them out of Baiji, 40 km (25 miles) further north, in October. They hope to maintain the momentum and continue north to recapture the Islamic State stronghold of Mosul.
Security forces' control over territory outside major population centers can be more difficult to maintain. An attack this far south highlights the group's continued reach, especially in rural areas, even after the government claimed victory last month in the western city of Ramadi.