Probe on for Boston bombers

BOSTON (AP):Investigators in the Boston Marathon bombing pressed the search yesterday for one or more potential suspects spotted on video, while President Barack Obama paid a visit under heavy security to offer reassurance to the city and a warning to those responsible for the attack: "We will find you."

In Washington, Homeland Security Secretary Janet Napolitano said the FBI wants to speak with individuals seen in at least one piece of footage from the race, but she said she isn't calling them suspects. She gave no details on what the video shows.

At an interfaith service honouring the three people killed and more than 180 wounded in Monday's twin blasts, the president sought to inspire a stricken city and comfort an unnerved nation, declaring that Boston "will run again".

"We may be momentarily knocked off our feet," Obama said at the Roman Catholic Cathedral of the Holy Cross. "But we'll pick ourselves up. We'll keep going. We will finish the race."

The crowd applauded as Obama warned those who carried out the attack: "Yes, we will find you. And, yes, you will face justice."

There was a heavy police presence around the cathedral as residents lined up before dawn, hoping to get one of the roughly 2,000 seats inside. By 9 a.m., they were being turned away.