Published: Feb 22, 2012 12:38 PM EST
Updated: Feb 22, 2012 12:45 PM EST

NEWARK, N.J. (AP) - Americans in New Jersey's largest city were subjected to surveillance as part of the New York Police Department's effort to build databases of where Muslims work, shop and pray. The operation in Newark was so secretive even the city's mayor says he was kept in the dark. For months in mid-2007, plainclothes NYPD officers snapped pictures of mosques and eavesdropped in Muslim neighborhoods. The result was a 60-page report, obtained by The Associated Press. It cited no evidence of crimes. It was just a guide to Newark's Muslims. The operation was done in collaboration with the Newark Police Department. But Newark Mayor Cory Booker says he never authorized it, and he's investigating how it happened.