Boston Marathon Bombing Suspect ID'd? IMAGES: No Arrests Made, Men Identified as Persons of 'High Interest' Through Photos, Video

Two men have been identified as possible suspects behind Monday's bombings at the Boston Marathon.

The men were seen in images near the finish line of the marathon moments before twin bombs exploded, killing three people and injuring about 180 other-a law enforcement official said to CNN.

As part of the investigation that began two days after the bombings, a circular was sent out on Wednesday to federal and state agencies and it featured photos "in an attempt to identify individuals" who were of "high interest" to investigators, according to CNN.

One of the two men is seen in a photo carrying a black backpack and an FBI official had said earlier that authorities believe that the bombs had been placed in a black nylon bag of some sort, according to CNN.

However, "the source said that authorities had not yet identified the two men by name and that the photographs were not being released to the public for fear of impeding the investigation."

Earlier on Wednesday, two official sources with background information on the investigation identified a name, whose name is unknown, as a possible suspect.

"There is one individual in particular that they are most interested in and what they believe is it is possible that have collected an image of the bomber around the time the device was placed," CBS News Senior Correspondent John Miller reported.

An official who had been briefed on the bombing investigation of the Boston Marathon said that authorities have an image of a suspect carrying, and possibly dropping, a black bag at the scene of the second bombing on Boylston Street, outside of the Forum restaurant, according to The Boston Globe.

It is not yet known if this man is one of the two suspects that have been identified in the photographs that have been distributed to law enforcement officials, according to CNN.

Boston Mayor, Tom Menino, told said that the investigators are "very close" to identifying a suspect, according to CBS Boston.

CNN has spoken to some sources that said it is too early for a suspect to be identified, while others say that they have a clear ID.  Governor Deval Patrick of Massachusetts said that investigators are closer to cracking this case "every hour," on CNN's The Situation Room.

"What I would say and I would ask of everyone is we give law enforcement the space to do their work," Patrick told CNN. "When they are ready with a complete picture, they will tell us what that picture is."

Although authorities have made "significant progress," Boston police and the FBI have denied that any arrests have been made at this time, according to CNN.

As investigations continue there is a lot of material that can be used.

"We live in a world where when we're out in public there is no reasonable expectation of privacy," John Miller, a CBS News Correspondent. "I think somebody who does something like this understands that that comes with the territory"

"The camera from Lord & Taylor is the best source of video so far," Dot Joyce, a spokeswoman for Mayor Menino of Boston, told The Boston Globe. "All I know is that they are making progress."