The Defence Headquarters has said that the 287 students of a school in Kuriga, Kaduna State, who were kidnapped last week are being held in locations that are difficult to get to.   Director of Defence Media Operations, Major General Edward Buba who spoke to newsmen on Thursday, March 14, said the kidnappers are using their victims as human shields to prevent further air and land offensive against them.   He further revealed that it took more than six hours after the students were abducted for the information to get to security agencies before machinery was commenced for the rescue…