The city of Boston is braced for an emotional week, one year on from the marathon bombings.
A ceremony is due to be held honouring the victims, medical and security personal and others.
Three people were killed and 264 injured in the twin blasts.
Those that survived have been recounting the road to recovery.
Roseann Sdoia has learned a lot over the past year: “I don’t think anybody knows what they’re capable of doing until you’re forced to be in it. And, you know, I think most people would want to get back to normal. And I think that’s what I want to do, and I know it sound so cliched but I just want to be normal. I want to be pre-April 15th.”
Heather Abbott said she has surprised herself: “I learned that I’m much stronger and more resilient than I ever could have imagined.”
Those that survived the double bomb blast will walk to the finish line and observe a minutes silence at 2:49 pm the moment the bombs exploded.
Brothers Tamerlan and Dzhokhar Tsarnaev are accused of the bombings, as well as killing a police officer during the manhunt. Tamerlan was killed in a police shootout. Dzhokhar is in custody and faces the death penalty if convicted.
The 2014 Boston Marathon will be run on April 21.