Boston Explosions Update : NYC Deploys Anti-Terrorism Vehicles To Landmarks, Hotels

Update 6:00 PM EST: LIRR, Metro-North Tightening Security 

"The MTA Police Department, which patrols the LIRR & Metro-North, is increasing police patrols today in response to the Boston incident," according to the agency's twitter feed. 

Update 5:00 PM EST: Michael Bloomberg Releases Statement 

"As law enforcement authorities investigate today's explosions in Boston, I ask all New Yorkers to keep the victims and their families in your thoughts and prayers. I have spoken with Police Commissioner Ray Kelly, and the NYPD has stepped up security at strategic locations and critical infrastructure, including our subways. 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. We have 1,000 members of the NYPD assigned to counter-terrorism duties, and they - along with the entire NYPD and the investments we have made in counter-terrorism infrastructure - are being fully mobilized to protect our city." 

Update 4:50 PM EST: NYC RESPONDS- 

New York Governor Andrew Cuomo posted on twitter about the security measures being taken around the city. 

"#NYS agencies, incl. @NYSDHSES @MTAInsider @PANYNJ, on a heightened state of alert as we learn more about the #BostonMarathon tragedy," the post reads. 

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New York Police Department Deputy Commissioner Paul Browne says that authorities are tightening security throughout the city in response to the explosions at the Boston Marathon, Reuters reports.

Counter-terrorism vehicles are also being deployed to various New York City landmarks and hotels in response to the Boston Marathon explosions.

"NYPD is stepping up security at hotels and prominent locations in NYC until more is known about #BostonMarathon," the NYC Mayor's Office twitter account posted.

Police have now confirmed that at least one explosion occurred near the finish line of the Boston Marathon at 673 Boylston Street, Reuters reports.

"There was an explosion, police, fire and EMS are on the scene. We have no indication of how many people are injured," a spokeswoman for the Boston Police Department said.

Latest reports from the Boston Police Department confirm that there are 2 deaths and 22 injured as a result of the explosions.

As of 4 p.m., local news reports say that there was a third explosion.

Just moments ago, at 4:21 p.m., an intelligence official reported that two more explosive devices were found at the Boston Marathon and are in the process of being dismantled, the Associated Press reports.

Check back for up-to-the-minute updates on this breaking news story.