At least four people were killed and 29 wounded in car bomb explosions in the Iraqi capital of Baghdad on Wednesday, a police source told Xinhua.

The attacks occurred when a car bomb went off in Camp Sarah district near the University of Technology in east Baghdad, leaving one people killed and nine others wounded.

Simultaneously, another car bomb ripped through a nearby busy intersection in the same district, killing one and wounding three others.

Also two people were killed and eight injured in a car bomb explosion in Shaab district in northeastern part of Baghdad. Another car bomb struck Baghdad's southeastern district of Zaafaraniyah, wounding nine people.

The toll could rise as ambulances, police and civilian vehicles evacuated the casualties to different hospitals and medical centers in the city.

Iraq is witnessing its worst violence in recent years. According to the UN Assistance Mission for Iraq, a total of 8,868 Iraqis, including 7,818 civilians and police personnel, were killed in 2013, the highest annual death toll in years.