波士顿周二纪念马拉松爆炸案一周年

U.S. Vice President Joe Biden is joining local leaders in Boston on Tuesday for a ceremony marking the one-year anniversary of the deadly bombings at the Boston Marathon.

Biden is scheduled to speak at the event along with Boston Mayor Martin Walsh and Massachusetts Governor Deval Patrick.  Organizers say the tribute will honor those affected by the bombing, and include victims' families and medical staff.

Two bombs exploded near the marathon finish line last year, killing three people and wounding more than 250 others.

Authorities say brothers Tamerlan and Dzhokhar Tsarnaev carried out the attack using homemade pressure cooker bombs. 

The blasts set off a multi-day manhunt that ended with Tamerlan Tsarnaev dead from a shootout with police and a bloody Dzhokhar being arrested in a Boston suburb.

Dzhokhar is due to go on trial in November on 30 federal charges and will face the death penalty.