The Vice President Joe Biden and his wife Jill are among attendees at a memorial service to honour Officer Sean Collier, who was shot and killed on 18th April in the aftermath of the Boston Marathon bombings. Authorities expected around 10,000 people to attend.
Among those terribly injured by the Boston marathon bombs was a dance instructor. Adrianne Haslet-Davis lost her foot in the explosion.
The mother of the two brothers suspected of carrying out the Boston bombings told ITV News they saw last year's race but are innocent.
Boston's marathon bombing suspect Dzohkhar Tsarnaev was charged with an offence that could lead to the death penalty, if he is found guilty.