Description:Nigeria's northern town of Damaturu has been a flash-point of attacks by the radical Islamist sect Boko Haram. Now the town has become a ghost town as government troops move in to squeeze out members of the Islamic sect Boko Haram. On Saturday President Goodluck Jonathan imposed a state of emergency in parts of Nigeria plagued by a violent Islamist insurgency. On Christmas Day Boko Haram set off a series of bombs that killed at least 37 people at one church.(1:08)