Seven people were killed and 15 others wounded in separate violent attacks in Iraq on Wednesday, police and medical sources said.

A suicide bomber rammed his explosive-laden car into a police station and blew it up in the city of Baiji, some 200 km north of the Iraqi capital Baghdad. The blast killed two policemen and injured four others.

In Iraq's Anbar province, artillery and mortar shelling on several neighborhoods in Fallujah, some 50 km west of Baghdad, during the day left three people dead and seven others injured.

In a separate incident, two soldiers were killed by sniper shots during clashes between the army and gunmen near the town of Khaldiyah, some 80 km west of Baghdad.

Also in the province, mortar barrage struck the town of Saqlawiyah, just north of Fallujah, damaging several houses and wounding four civilians.

Anbar province has seen fierce clashes that flared up after Iraqi police dismantled an anti-government protest site outside Ramadi in late December last year.

Iraq is witnessing its worst violence in recent years. The country is hosting a two-day international counter-terrorism conference. Representatives from some 25 countries as well as a number of world organizations have attended the meeting.

It aims to study and discuss how to deal with extremist ideologies that fuel violence.

Iraq has been plagued with violence for years. Last year was the bloodiest since the sectarian violence began to decrease in 2008.

A total of 8,868 Iraqis, including 7,818 civilians and police personnel, were killed in 2013. The Iraqi government has frequently warned and complained of the spillover of violence from the crisis in neighboring Syria.