(CNN) -- "United, we will always persevere." That was the message Massachusetts shared with the nation and the world Tuesday, on the anniversary of twin bombings that turned last year's Boston Marathon from a celebration into a day of horror.
The state tweeted those words, along with an image of both the U.S. and Massachusetts flags, and the hashtag #BostonStrong.
Mayor Tom Menino, Gov. Deval Patrick and Vice President Joe Biden are expected to echo that message Tuesday afternoon at a tribute marking the anniversary. The Boston Pops and a children's choir will take part.
Three survivors are scheduled to speak: Patrick Downes, David Yepez and Adrianne Haslet-Davis. Downes was a newlywed at the time of the attack. He and his wife, Jessica Kensky, each lost a leg.Yepez, a teenager, was injured. He'll be joined at the ceremony by his father, Luis. Haslet-Davis, a dancer, lost her left foot in the attack.
Near the end of Tuesday's ceremony, at 2:49 p.m. ET, will be a moment of silence, followed by church bells tolling and a flag-raising ceremony.