Reports of knocking and mystery figures disappearing into the night had Dunedin police chasing shadows last night. Multiple searches around the area for the mystery knockers by police turned up nothing, Senior Sergeant Craig Dinnissen said. At 11.40pm, residents at a house in George St started hearing bangs and knocks coming from inside their home. They found their back door wide open and outside saw two shadowy figures fleeing into the night. In an unrelated incident residents in Brown St, Central Dunedin, reported a figure lying in the front garden of their neighbour's home.