-- "The Islamic Republic condemns killing of innocent people in U.S. Boston, Pakistan, Afghanistan, Iraq and Syria in equal measure," Iran's Ayatollah Ali Khamenei said Wednesday, according to a report from the country's state-run Press TV.
-- Obama will travel to Boston on Thursday for an 11 a.m. interfaith service dedicated to the victims.
-- Crowds gathered for a vigil on the Boston Common on Tuesday night. They sang songs and lit candles, and some wept.
-- In New York, the Yankees played "Sweet Caroline" during their game against the Arizona Diamondbacks in a tribute to the victims. The Boston Red Sox team has played the Neil Diamond song during its games for the past 15 years.