Ibrahim Mbaya, the camp chairman of the GSS IDP camp in Gwoza, explains that two weeks earlier there had been a well-coordinated and intense attack by Boko Haram. The camp was caught in the cross fire of the night-time attack. He said: ''The attacks mean there are unexploded shells. We are grateful to Mines Advisory Service (MAG) for helping us learn how to recognise the threat. People find things and now report them to me rather than trying to pick them up.''