Iraqi soldiers gather at the site of blast in Baghdad, capital of Iraq, March 14, 2013. Up to 21 people were killed and some 50 wounded in a series of car bombings and shootings in central Baghdad on Thursday, an Interior Ministry source said. (Xinhua/Bashar)

Iraqi soldiers gather at the site of blast in Baghdad, capital of Iraq, March 14, 2013. Up to 21 people were killed and some 50 wounded in a series of car bombings and shootings in central Baghdad on Thursday, an Interior Ministry source said. (Xinhua/Bashar)

Iraqi soldiers gather at the site of blast in Baghdad, capital of Iraq, March 14, 2013. Up to 21 people were killed and some 50 wounded in a series of car bombings and shootings in central Baghdad on Thursday, an Interior Ministry source said. (Xinhua/Bashar)

The photo taken on March 14, 2013 shows the site of blast in Baghdad, capital of Iraq. Up to 21 people were killed and some 50 wounded in a series of car bombings and shootings in central Baghdad on Thursday, an Interior Ministry source said. (Xinhua/Bashar)

Rescuers gather at the site of blast in Baghdad, capital of Iraq, March 14, 2013. Up to 21 people were killed and some 50 wounded in a series of car bombings and shootings in central Baghdad on Thursday, an Interior Ministry source said. (Xinhua/Bashar)

Smoke billows from a building at the site of blast in Baghdad, capital of Iraq, March 14, 2013. Up to 21 people were killed and some 50 wounded in a series of car bombings and shootings in central Baghdad on Thursday, an Interior Ministry source said. (Xinhua/Bashar)