New footage from the Boston Marathon shooting has surfaced showing a possible suspect by the site of the second bomb explosion.

Authorities believe they have identified a suspect in Monday's Boston bombings, according to CNN, which attributed the news to an unnamed source who spoke to the network's John King exclusively.

The FBI is holding a press conference at 1:30 p.m. and may announce the news then. The Boston Globe reported that officials said they are "very close" in the investigation.

An official briefed on the investigation said Wednesday that authorities have an image of a suspect carrying - and perhaps dropping - a black bag at the second bombing scene on Boylston Street.

The video is said to be a "clear identification of a suspect," obtained with help from a local TV station. King's source called it a "significant breakthrough" in the investigation and a "game changer." The source confirmed that there is "one suspect."

A second source with knowledge of the investigation told the reporter that department store video from a Lord & Taylor in Copley Square shows clear facial recognition of the confirmed suspect. Invesitgators are "making progress" with help of the video, according to spokeswoman for Boston Mayor Thomas Menino.

It was confirmed at a press conference on Tuesday that only two explosives were found yesterday and those are the ones that detonated. No unexploded devices were found - contrary to previous reports. Ed Davis, police commissioner of the City of Boston, said they are working on "the most complex crime scene" ever in the history of their department.