Two U.S. service members were killed Sunday in northern Iraq, making June the deadliest month for American combat fatalities in more than two years, officials said.

The U.S. military announced the deaths in a statement but did not identity the victims or provide specifics on how they died, pending notification of relatives. But the deaths occurred on a day that saw mortar attacks on several U.S. military bases.

So far in June, 11 U.S. troops have been killed in Iraq, all of them from hostile fire, according to It’s the highest monthly total for U.S. combat fatalities since May 2009, before the U.S. military largely pulled its troops from Iraqi cities.

But as remaining U.S. troops prepare to withdraw from the country by the end of the year, military commanders are warning that there could be an uptick in attacks against them. So far this year, 22 troops have by killed by hostile fire in Iraq, equal to the number killed in combat in all of 2010, according to

Elsewhere in Iraq on Sunday, a suicide bomber blew himself up at a police station about 15 miles north of Baghdad. At least two police officers were killed and 17 others were injured, including eight civilians.

Iraqi media reported that one Iraqi soldier was killed in an armed clash near Mosul in northern Iraq, and that two civilians were killed in Kirkuk when a bomb detonated next to a convoy carrying a local official, according to the Aswat al-Iraq news agency.