The church bells rang out in Boston following a moment of silence honouring those affected by the marathon bombings a year ago today.
As an American flag was raised the crowd, including Vice President Joe Biden, sang the National Anthem.
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The Democratic presidential nominee pledged to foster an inclusive society, create jobs and make college tuition debt free for all.
The 16-year-old, who has a social media following of over 15 million people, suffered two fractured ribs, a bruised lung and concussion.