Dozens killed in violence in northern Nigeria  
 

Deadly clashes have erupted between members of a Muslim group and police officers in the north of Nigeria.

The group Boko Haram, which wants to impose sharia (Islamic law) across the country, has attacked police stations and churches.

Al Jazeera's Roza Ibrahimova reports on the unrest which is spreading across the northern provinces.

 
 

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