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Jos, Nigeria (CNN) A series of blasts, some of them targeting places of worship, has killed scores of people in Nigeria, where the military is battling the Islamic extremist group Boko Haram.

The heaviest death toll was in Jos, in central Nigeria, where two deadly explosions struck late Sunday not far from each other.

One blast ripped through a restaurant in a shopping complex in an area popular with travelers and where many Muslim families live. The restaurant was full of customers when the explosion went off, witnesses and survivors said.

The other attack took place at a crowded mosque as a sermon for the holy month of Ramadan was being delivered. Unidentified attackers opened fire outside with guns before launching a rocket-propelled grenade at the mosque, witnesses said.

Ado Aliyu, a survivor who was shot in the arm, told CNN that about five gunmen entered the crowd and started shooting, setting off a stampede before the explosion struck.

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