A memorial service takes place in Boston, marking one year since the deadly Boston Marathon bombings.
Vice President Joe Biden, Massachusetts Governor Deval Patrick, survivors, and victims of family members spoke during the service.
Three people were killed and more than 250 others were injured in the attacks.
Investigators say two brothers planned and orchestrated the attack.
One died during a shootout with police several days after the bombings. The other was arrested after an intense manhunt.
Several survivors spoke at the memorial ceremony.
Patrick Downes, Boston Marathon bombing survivor, "We chose to run toward smoke and danger. We chose to utilize our belts and purse straps to create tourniquets. We chose to hold the injured in our arms. We chose to offer our hearts to those in despair and our treasures to those in need."
Adrianne Haslet-Davis, Boston Marathon bombing survivor said, "Of all the lessons I have learned over this past year is that something in your life, or anyone's life can go horrifically wrong in a matter of seconds. Yet, it is up to us to make every second count after because believe me, they do."
More than 100 cameras and 50 observation points will help monitor the crowd at this year's marathon to make sure the race is safe.