Eyewitnesses of Boston Marathon terror attack pictured a man running away with a bag. The photos also show remains of the explosive device.

Boston authorities have already applied for help in investigating the tragedy. At the moment FBI experts are trying to reconstruct the sample of an explosive using, materials found at the site, yahoonews reported.

Two bombs went off Monday near the finish line of the fabled Boston Marathon. Three people were killed and over 180 were wounded.

US Embassy said there is no information on any Armenian citizens that might have been affected as a result of the explosions during the Boston Marathon.