(PHOTOS) Evidence So Far: Boston Marathon Bomber Suspect Pictured Walking Calmly Away From Scene.

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.

According to CNN Breaking News, Police sealed off densely populated portions the Boston metro area early Friday after a violent night chasing the Boston Marathon terror suspects left one of the men and a police officer dead.

Police ordered businesses in the suburb of Watertown and nearby communities to stay closed and told residents to stay inside and answer the door for no one but authorities. The subway and Amtrak train systems have been shut down. Every Boston area school is closed.

Boston’s public transit authority sent city buses to Watertown to evacuate residents while bomb experts comb the surroundings for possible explosives.

Police shot one of the men dead after a wild car chase through Watertown in which authorities say they hurled explosives at pursuing officers.

Police believe the men are the same ones pictured in images above. The first suspect, the one believed killed by police, appears in the images wearing a dark hat, sunglasses and a backpack. The second suspect, wearing a white cap, is the one who remains at large, police said.

It has also been reported that the suspects have now been identified as Tamerlan Tsarnaev, 26, second suspect is Dzhokhar Tsarnaev, 19, sources say. (Evidently they are brothers).

Source: CNN