Apparently the NYPD is on high alert since it's right after the September 11 anniversary because there were many cops in and outside Washington Square Park this evening.
Outside the park:
These guys wore NYPD Police Counterterrorism Bureau patches.
I looked all throughout the park for the resident Red-tailed Hawks but didn't find them.
A fellow Hawk-watcher has seen them follow the same evening pattern a few nights in a row so I set out to observe them tonight but as my luck would have it they changed their behavior the night I visit. :) Better luck next time!