New York Police Department Helicopter Searches East River at Pier 17 South Street Seaport

I was at the South Street Seaports' Pier 17 last night and while there, I saw some lights off in the distance in the East River, between the Manhattan and Brooklyn Bridges. I noticed they were from a NYPD helicopter, which was hovering and pointing it's search lights at the water. It then came closer and closer to wear I was and dropped very low to the water in an apparent search mode. I didn't bother to ask them what was up but I did shoot this video.