Tuesday marked the one year anniversary of the Boston Marathon bombings that killed three people and injured over 260. President Obama will observe a moment of silence at 2:49 p.m. ET, the time the two bombs exploded. Vice President Joe Biden is in Boston to speak at a memorial service. 

The Tsarnaev brothers, the suspected masterminds, also killed a police officer at the Massachusetts Institute of Technology as they went on the run for two days. Tamerlan, the eldest, was killed, and Dzhokar is currently in a maximum security prison in Massachusetts. He has pleaded not guilty to 30 counts, and is slated to go on trial in Novemeber. 

SEE ALSO: Boston Marathon Runner Finished Minutes Before The Explosions 

Survivors from last year’s race visited the finish line on Tuesday to commemorate the occasion. The 118th Boston Marathon will be held next Monday, April 21, 2014, Patriot’s Day in Boston. The White House released a statement honoring the victims, survivors, and first responders: “And when the sun rises over Boylston Street next Monday- Patriot's Day- hundreds of thousands will come together to show the world the meaning of Boston Strong as a city chooses to run again."

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