BOSTON (AP) -- A moment of silence, the tolling of church bells and a call for kindness will mark the second anniversary of the 2013 Boston Marathon bombings.

Flowers and signs adorn a barrier, two days after two explosions killed three and injured hundreds, at Boylston Street near the of finish line of the Boston Marathon (AP Photo/Charles Krupa, File)

Mayor Martin J. Walsh and other officials will raise commemorative banners on Boylston Street early Wednesday morning.

A moment of silence follows at 2:49 p.m., when the first of two bombs exploded near the finish line on April 15. Church bells will then ring throughout the city.

Walsh has declared April 15 "One Boston Day," a new tradition in which Bostonians are encouraged to show kindness and generosity.

Three people were killed and more than 260 others were wounded in the attacks. The surviving bomber, Dzhokhar Tsarnaev has been convicted of 30 counts during his federal trial and could face the death penalty.

(© 2015 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistribute)