BOSTON (AP) — Bostonians will mark the second anniversary of the deadly Boston Marathon bombings with a citywide moment of silence, the pealing of church bells and a call to engage in random acts of kindness.

Mayor Marty Walsh plans to help hoist commemorative banners on Boylston Street on Wednesday before leading a moment of silent tribute to the victims at 2:49 p.m. — the hour when the first of the two bombs exploded near the finish line on April 15, 2013.

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Three people were killed and more than 260 others wounded in the attacks.

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Walsh says bells will ring out across Boston after the moment of silence. The mayor decreed that April 15 will be known as “One Boston Day” — a new tradition to honor the city’s resilience and spread goodwill.

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