More Security in New York After Explosions in Boston Kill 3, Injure Over 100

Following a series of bombs that exploded in Boston, killing at least two and injuring over 100, the New York Police Department has heightened security around New York City hotels, subway platforms and heavily populated landmarks, including Times Square, Rockefeller Center and the World Trade Center site.

"I have spoken with Police Commissioner Ray Kelly, and the NYPD has stepped up security at strategic locations and critical infastructure, including our subways," Mayor Michael Bloomberg said on Monday afternoon in a statement. "Some of the security steps we are taking may be noticeable, including deployment of Critical Response Vehicles and additional police personnel, and others will not be."

Over 1,000 NYPD counter-terrorism representatives have been mobilized throughout the city, Bloomberg said.

While at a public event Monday night, Bloomberg urged New Yorkers to look out for suspicious behavior.

"We are asking all New Yorkers to remain vigilant in the days ahead," the mayor said, according to The New York Post. "If you see something that looks strange just pick up the phone and say something. But at the same time, we refuse to let cowardly acts of violence stop us from living in our city, the city that we love."

The Metropolitan Transportation Authority has tightened security on the Long Island Railroad and Metro North commuter rails.