Burnt out school block following a gun battle and explosions by 

Burnt out school block following a gun battle and explosions  by the Boko Haram sect in Potiskum, Nigeria, Saturday,  Oct. 20 , 2012. A Chinese construction worker has been killed in a besieged city in Nigeria's northeast, an official said Friday, exacerbating security concerns for foreign workers in Nigeria's violence-wracked northeast, while an overnight raid in a nearby city left 5 others dead and several schools razed to the ground. (AP Photo/Adamu Adamu)
Associated Press
Burnt out school block following a gun battle and explosions by the Boko Haram sect in Potiskum, Nigeria, Saturday, Oct. 20 , 2012. A Chinese construction worker has been killed in a besieged city in Nigeria's northeast, an official said Friday, exacerbating security concerns for foreign workers in Nigeria's violence-wracked northeast, while an overnight raid in a nearby city left 5 others dead and several schools razed to the ground. (AP Photo/Adamu Adamu)
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