A Christian man was killed by unidentified gunmen in the city of Mosul, police announced on Wednesday, DPA reported.
Mosul and its environs are among the most ethnically and religiously diverse - and dangerous - regions of Iraq. Iraqi and US officials describe the city as al-Qaeda's last urban stronghold in the country.
Since January, at least 13 Christians have been killed in Mosul, some 400 kilometers north of Baghdad.
Attacks that preceded the January 2009 provincial polls drove some 450 Christian families to flee the city after at least 35 members of the minority community were killed.
Tensions have been high in the province since an Arab nationalist party won last year's provincial polls on a platform of taking back control of the government and security services from Kurdish parties and allied militias.
Police also announced that the house of a former high-ranking army officer named Maged Mahmoud al-Zawbai was attacked with explosives by militants on Tuesday night in the area of Abu Ghraib, 20 km west of Baghdad.
Al-Zawbai and his wife were injured in the attack.