A fire that spread to neighbouring properties in Woodstock early Saturday morning has caused an estimated $1 million in damage, authorities say. Woodstock Fire Department crews were dispatched to a reported structure fire on Upper Thames Drive at about 5:25 a.m. The blaze had extended to adjacent properties by the time firefighters arrived. Officials said a joint investigation involving the Woodstock Fire Department and Woodstock Police Service is underway to determine the cause of the fire. Police and fire officials have not released further details as the investigation continues.