From the Daily News:
Vandals, drug-dealers and muggers beware: Electronic eyes are watching you.
The Parks Department has mounted about 20 cameras across the city in an effort to thwart after-hours crime. The cameras at city parks detect motion and respond with a blinding flash of light and a booming recorded warning.
"Your picture has been taken for suspicious activity by the NYPD!" the recording bellows.
The Parks Department said the cameras have helped stem after-hours crime in city parks, with the first one going up in Manhattan's Highbridge Park in the spring of 2008. The Fort Tryon camera went up a few months ago.
City officials said the cameras can be moved around to problem locations based on need. They've been at Central Park, Marine Park in Brooklyn, South Beach in Staten Island and Flushing Meadows-Corona Park in Queens - among other sites.
Park managers review the tapes regularly and share them with NYPD precincts for review.