From NPR News in Washington, I'm Lakshmi Singh.A sorrowful performance from renowned cellist Yo-yo Ma, on a day of reflection for the city of Bostonfollowing Monday's terrorist attack that killed three people and wounded more than 170.Today president Obama spoke during an interfaith service,and NPR's Ari Shapiro was there.President Obama delivered an emphatic message of strength and healingcomparing the city and the country to Marathonerswho keep going no matter the adversity."We carry on, we race, we strive,we build and we walk and we love and we raise our kids to do the sameand we come together to celebrate life and walk our cities and cheer for our teams."He then thanked Boston's Marathon volunteers at a gym across the street.He told them they've inspired the countryand he's looking forward to the 118th Boston Marathon next spring.Ari Shapiro NPR News, Boston.Homeland security secretary Janet Napolitano brief lawmakers on Capitol Hill today about the investigation into Monday's bombingsthat killed three and wounded more than 170.She says video taken just before the explosions showstwo men displaying suspicious behaviour."There is some video that has raised the question of those,that the FBI would like to speak with.I wouldn't characterize them as suspects under the technical term.But we need the public's help in locating these individuals."
