An improvised explosive device blew up at the Parsons Green station, injuring at least 20 people during Friday morning's rush hour. While the units' presence may be unsettling for some, the NYPD says it's simply a sign of the times. "They don't want to see the long guns, and the helmets because it's, the world that has changed, and my message is yes, the world has changed since 2001, and this is the new world we live in, and this is the way we protect New York City".
New York State will enhance security in public places as a safety measure after an explosion at a London subway station earlier in the day, Governor Andrew Cuomo announced in a press release on Friday.
Department spokesman J. Peter Donald said the NYPD was monitoring intelligence through a joint terrorism task force.
Security is also being increased at airports, bridges and tunnels.
Commissioner James O'Neill said there had been no direct threats to New York City, but people should always be vigilant and aware of their surroundings.