Picture: Boston marathon killer walking away calmly

A new image has emerged of the second suspect in the Boston Marathon bombings calmly walking away from the scene of carnage. The image taken by Florida businessman David Green emerged just hours after the FBI lodged an appeal to identify two suspects behind the attacks that killed three and injured over 180. His picture shows runners and spectators fleeing in panic around the suspect, closely resembling the man identified by officials as Suspect Number Two, who is wearing a white basketball cap and a dark hooded sweatshirt. Mr Green has spoken to the FBI and told the New York Times and CNN's Piers Morgan that agents believe the man is Suspect Number Two.

Pictures: Boston bombing victims

Krystle Campbell

Lu Lingzi

Martin Richard

A service was held in honor of Lu Lingzi, left, Krystle Campbell, and Martin Richard.

 In a moving interfaith service, PresidentObama declared to cheers from the 2,000-strong crowd: 'This time next year, on the third Monday in April, the world will return to this great American city to run harder than ever, and to cheer even louder, for the 118th Boston Marathon. Bet on it.'   

But, as well as remembering the three people killed and more than 170 injured, the president offered reassurances to Americans nervous about the nation's safety, insisting the perpetrators of the senseless bombings would be caught and held to account, even as investigators scramble to answer key questions about the attacks.

'That's the message we send to those who carried this out and anyone who would do harm to our people. Yes, we will find you. And, yes, you will face justice. We will find you. We will hold you accountable,' he said.

As I watched, tears filled my eyes especially when I saw the cardboard held by Martin Richard. It had inscribed on it "NO MORE HURTING PEOPLE........PEACE" . What an irony!

May the souls of the departed rest in peace.