BOSTON (NBC/AP) - President Barack Obama declared "there is a piece of Boston in me" as he paid tribute to a city shaken by what he has called an act of terror. He said: "Every one of us stands with you."
Obama addressed an interfaith service in the aftermath of Monday's twin blasts that killed three and injured more 170 people at the finish line of the Boston Marathon.
Obama said a day of beauty was shattered when a celebration became a tragedy. He said Boston gathered Tuesday, quote, "to reaffirm that the spirit of this city is undaunted." He declared: "You will run again!" Of the perpetrator, he said: "We will find you."
The president and first lady traveled to the Cathedral of the Holy Cross in Boston Thursday, a show of support for a city that lost three people Monday and saw scores more battered and maimed when bombs exploded near the Boston Marathon finish line.
The Obamas attended a prayer service hosted by the city's spiritual leaders, a chance to pray for the victims and for a quick arrest in the case.
NBC News has learned investigators are focusing on two men they've spotted on surveillance video shot near the bomb sites.
The pair are seen talking on cellphones, while dropping bags or backpacks in the spots where the devices exploded.
The race is on to figure out who they are, where they are, and why they did it.
At a house hearing Thursday morning Homeland Security Secretary Janet Napolitano deflected criticism that the investigation is moving too slowly.
"This is not an NCIS episode," Napolitano said. "Sometimes you have to take time to properly put the chain together to identify the perpetrators."
In addition to first responders and local officials, the president set aside some time to meet with victims recovering from their wounds.