Emma MacDonald, 21, center, cries during a vigil for the victims of the Boston Marathon explosions at Boston Common, Tuesday, April 16, 2013. Twin explosions near the marathonís finish line Monday killed three people, wounded more than 170 and reawakened fears of terrorism. (AP Photo/Julio Cortez)
Emma MacDonald, 21, center, cries at a vigil for victims of the Boston Marathon bombings at Boston Common, April 16, 2013. (AP Photo/Julio Cortez)