Hong Kong police are investigating after a man with multiple knife wounds was found in a lift at a public housing block in Wong Tai Sin, seven minutes before another man was discovered to have fallen to his death at the same building.Police received the first report at 7.19am on Saturday after the injured man was found inside a lift at Chiu Sin House in Upper Wong Tai Sin Estate.The man, who had sustained several knife wounds, was taken to Queen Elizabeth Hospital for treatment. Police said he...