A New York Police Department bomb squad

A New York Police Department bomb squad member investigates a gasoline can that was in a suspicious vehicle (L, door open) early Friday, May 14, 2010 near Union Square in New York. Police gave the "all clear" after investigating the suspicious vehicle was spotted in lower Manhattan near Union Square, and were leaving the scene after the car's owner, who owns a landscaping business that provides lawn mowing and other services, explained why he had the gas canisters in the vehicle. Nerves have been on edge in New York -- hit by the September 11, 2001 attacks -- ever since police found a large, but malfunctioning car bomb on May 1 in Times Square, a tourist destination that is one of the country's biggest intersections. AFP PHOTO / Stan Honda (Photo credit should read STAN HONDA/AFP via Getty Images)