Thousands of people across the United States have been marking the first anniversary of the Boston marathon bombing.
A moment of silence was observed to mark the time when the first explosion rocked the city.
Following the ceremony, the crowd walked down Boylston Street, the final stretch of the marathon.
The US Vice President Joe Biden led tributes to the victims and survivors of the attack which left three people dead and injured 264 others.
“It infuriates them that we refuse to bend, refuse to change, refuse to yield to fear. What makes me be so proud to be an American it’s that we have never, ever yielded to fear,” said Biden.
The bombing was the largest mass-casualty attack on US soil since Sept 11, 2001.
Authorities say the ethnic Chechen brothers, Dzhokhar and Tamerlan Tsarnaev, carried their bombs to the finish line in backpacks.
Tamerlan was killed in a shootout three days later. His younger brother is awaiting trial on charges that will carry the death penalty if he is convicted.