BAGHDAD — A string of insurgent attacks, including a car bomb targeting a Shi’ite mosque, killed 10 people in Iraq on Friday, officials said.

The strikes highlight the challenges still facing Iraq’s Shi’ite-led government as it struggles to maintain security across the country.

The car bomb struck a Shi’ite mosque as worshippers were at Friday prayers in a village near the former Al Qaeda stronghold of Mosul, 225 miles northwest of Baghdad. Three people were killed and 35 wounded in that attack.

Hours earlier, gunmen firedon a group of so-called Sahwa fighters at a checkpoint near Dujail, 50 miles north of the Iraqi capital.

The Sahwa are Sunni Arabs who joined forces with the US military to fight Al Qaeda’s Iraq branch at the height of the country’s insurgency. They have since been regularly targeted by Sunni insurgents who view them as traitors.

Elsewhere, a roadside bomb exploded on a police patrol 60 miles north of Baghdad. Three policemen were killed and two were hurt.