The attack took place in the town of al-Walid on Iraq’s side of the border. At least five officers were also hurt in the assault.
Since its blitz earlier this year, the “Islamic State” group has controlled most of the border crossings between Iraq and Syria. The Sunni militant group has also overrun a large part of Iraq’s Anbar and Ninevah provinces and now controls about one-third of both Iraq and Syria.
The attack came as the UN Assistance Mission for Iraq said that 1,232 Iraqis were killed and 2,434 were wounded in violence and terror attacks in November. Of those killed, at least 296 were members of Iraqi and Kurdish forces, as well as militias who fight alongside them.
The figures are a slight decrease from October, when the UN said at least 1,273 Iraqis had been killed.
Also last month, at least 402 people were killed in western Anbar province, according to the provincial Health Directorate, the UN mission said. Most of the victims died in the provincial capital of Ramadi, a battleground between the IS group and Iraqi troops. In Baghdad province, at least 332 people were killed in November, the UN said.
At least eight people died in the Shi’ite town of Balad, 50 miles north of Baghdad, after mortar shells hit a cluster of homes and a small market. Police officials said a woman and a child were among the dead and at least 20 people were wounded. Clashes are ongoing in Balad between IS militants and Iraqi forces.
Twin blasts have exploded in the north-eastern Nigerian city of Maiduguri in a crowded market where two female suicide bombers killed 70 people a week ago. Eyewitness reports said rescue workers were evacuating the dead and injured while police say it was too early to give a death toll.
There has been no immediate claim of responsibility but people are blaming Boko Haram, the Islamic extremist group.