NEW : At least four people are killed and 14 injured in two car bomb attacks in Baghdad . Civil ##ians taken hostage by gunmen are freed unharmed , security sources say . Iraqi police retake a building from gunmen , two of whom are killed . Separately , two car bombs exploded Thursday in different areas in the northeast part of the capital , killing four people and injuring 14 others . The United Nations says 2013 was the deadliest year in Iraq since independence .
NEW : At least four people are killed and 14 injured in two car bomb attacks in Baghdad . Civil ##ians taken hostage by gunmen are freed unharmed , security sources say . Iraqi police retake a building from gunmen , two of whom are killed . The United Nations says 2013 was the deadliest year in Iraq since independence .