Updated

Attacks around Iraq Sunday, including a suicide car bombing, killed at least 12 people, officials said, the latest in a surge of violence that has brought up the grim prospect of escalation into sectarian civil war.

The car bomber rammed his vehicle into a Kurdish security patrol in country's north and killing eight. He struck as the patrol was passing through the ethnically-mixed northern town of Tuz Khormato, local police chief Col. Hussein Ali Rasheed said. Five people were wounded, he said.

Tuz Khormato is in territory contested by Arabs, Kurds and Turkomen about 200 kilometers (125 miles) north of Baghdad. Iraq's Kurdish self-rule zone maintains its own security forces.

In Baghdad's central Karrada neighborhood, a bomb attached to a minibus killed three commuters and wounded nine others, police said. Another bomb went off before dawn near a teahouse in the capital's northern al-Silaikh neighborhood, killing one and wounding 10 others, police said.

Two medical officials confirmed the casually figures. All spoke on condition of anonymity as they were not authorized to release information to reporters.

The attacks come during an increase in violence that is raising fears of a return to the widespread sectarian killing that pushed the country to the brink of civil war after the 2003 U.S.-led invasion. More than 3,000 people have died since April.

The bloodshed is linked to rising sectarian divisions between Iraq's Sunni and Shiite Muslims and friction between the Arabs and Kurds, dampening hopes for a return to normal life nearly two years after the last U.S. forces withdrew from the country.