At least 21 people were wounded in separate bomb attacks in Salahudin province in north of the Iraqi capital of Baghdad on Monday, a provincial police source said.

One of the attacks occurred in the morning when a car bomb went off while the convoy of Lieutenant Colonel Dawood al-Sahan, the chief of the police station, was leaving the gate of the station in eastern Shirqat, some 110 km north of the provincial capital city of Tikrit, the source told Xinhua on condition of anonymity.

Minutes later, two suicide bombers blew themselves up at the scene, the source said.

Al-Sahan escaped the attacks unharmed while 11 civilians and three policemen were wounded, the source said.

In a separate incident, a car bomb exploded at a police checkpoint outside the police academy in the southern entrance of Tikrit, some 170 km north of Baghdad, wounding four civilians and three policemen, the source said.

The blast took place about 500 meters away from a recruitment center where dozens of recruits were gathering, the source added.

Salahudin province is a Sunni dominated province, and its capital Tikrit is the hometown of the former president Saddam Hussein.

Iraq is witnessing its worst eruption of violence in recent years. According to the UN Assistance Mission for Iraq, almost 7, 000 Iraqis were killed and over 16,000 others injured from January to October this year.