Violence erupted in Iraq on Tuesday, with more than 30 slain and dozens injured in an atmosphere beset with political and Sunni-Shiite tensions.

At least 28 people were killed and more than 70 wounded in northern Iraq on Tuesday in fighting between security forces and gunmen, police said. The incident took place in Hawija, in Kirkuk province.

Earlier, at least four people were killed and 13 others were wounded when two roadside bombs exploded, one after another, outside a Sunni mosque in southern Baghdad, police said. The incident occurred in the neighborhood of Dora while Sunni worshipers were leaving the mosque, police said.