September 11 Memorial and Museum

FILE - A heavily armed NYPD officer and police dog stand guard next to a trader outside the New York Stock Exchange in New York City. (Photo by Mario Tama/Getty Images)

Ray Kelly: City On Heightened Alert For 9/11 Anniversary

The NYPD is strengthening its safety net around the city as the 9/11 anniversary approaches and the city’s top cop says he’s very concerned about an attack timed to coincide with the memorials.