Hundreds of residents from properties surrounding the site where a Second World War German bomb was detonated remain unable to return to their homes.The device, believed to be a 1,000kg “Hermann” bomb used by the Nazis, was discovered on a building site on private land to the west of the University of Exeter campus on Friday.Initially, a 100-metre cordon was erected, but this was extended to 400 metres on Saturday at the request of the Royal Navy bomb disposal team.