Hundreds of thousands of people poured onto the streets of New York as office blocks and other buildings emptied following a massive power cut. Outages were also reported in Detroit, Ottawa and Toronto. New York Mayor Michael Bloomberg said however there was no evidence of a terrorist attack. All shops shut and Grand Central station was evacuated and all subway stations were closed. Main roads in the city were choked with cars and people as commuters tried to walk home. But traffic lights were also out of action adding to the traffic chaos. Large swathes of Detroit and Cleveland lost their power shortly after 4:00 pm. **PHOTO CAPTION*** A huge power blackout hit U.S. and Canadian cities Thursday, Aug. 14, 2003, driving workers in New York and Toronto into the streets, shutting subways in blistering heat and closing four nuclear power plants in Ohio and New York state. (AP Photo/Courtesy WNBC-NY)