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A slew of bomb attacks killed about 50 people in the Iraqi capital and a village in the north of the country on Wednesday, according to hospital and police sources cited by Reuters.

Nobody claimed responsibility for the strikes, but groups - mainly a branch of al Qaeda and other Sunni Muslim militants - often target civilians as well as Shiites and Iraqi security forces.

In the deadliest incident, a bomb blew up mourners at a funeral for a pro-government Sunni Muslim militiamen who died two days ago, police said. It killed 18 people and wounded 16 in Shatub, a village south of Baquba, Reuters reported.

Deadly Bomb Attacks in Iraq

Jan. 15, 201401:11

Car bombs exploded across Baghdad, mostly in Shiite districts, killing 34 and wounding 71.

Sunni militants took over the city of Fallujah west of Baghdad two weeks ago, in a direct challenge to the rule of Prime Minister Nouri al-Maliki.

Two years after U.S. troops withdrew from Iraq, violence has reached levels seen in 2006 and 2007, when tens of thousands of people died.

Reuters and The Associated Press