The Federal Bureau of Investigation posted to YouTube Thursday surveillance camera footage which it says shows the bureau's two suspects in its investigation of Monday's attack on the Boston Marathon.

The bureau is requesting the public's help in identifying the suspects, but said the two men are considered armed and extremely dangerous. It urged the public not to approach them.

FBI Special Agent Richard Deslauriers said during a press conference that one of the men in the video, seen wearing a white cap, was recorded placing a bag at the location of the second blast just moments before that explosion.

The FBI also published several stills of the suspects, causing its website to load extremely slowly — likely due to the sudden rush of traffic. The man seen in the
red hat is not one of the suspects.

Remarks of Special Agent in Charge Richard DesLauriers at Press Conference on Bombing Investigation

 Good afternoon. My name is Richard DesLauriers. I am the special agent in charge of the Boston Division of the FBI.
Since Monday’s bombings, the FBI and our law enforcement partners have been working around the clock and are fully committed to investigating this matter to bring those responsible for justice.

Our collective law enforcement team has pursued thousands leads and tips. As I said two days ago, we are working methodically and with a sense of urgency to identify those responsible for the bombings. Within the last day or so, through that careful process, we initially developed a single person of interest. Not knowing if the individual was acting alone or in concert with others, we obviously worked with extreme purpose to make that determination. The entire force of the federal government, the FBI in Boston and around the world, as well as our partners in the Boston Police, ATF, Massachusetts State Police, and the more than 30 agencies of the Joint Terrorism Task Force, have set about to ensure that all responsible for the bombings will be brought to justice.
More importantly, it was done to ensure the future safety of the city, the commonwealth and the country. Indeed, through that process, the FBI developed a second suspect.

Today, we are enlisting the public’s help to identify the two suspects.
After a very detailed analysis of photo, video, and other evidence, we are releasing photos of the two suspects. They are identified as Suspect 1 and Suspect 2. They appear to be associated.
Suspect 1 is wearing a black hat
Suspect 2 is wearing a white hat.
Suspect 2 set down a back pack at the site of the second explosion just in front of the Forum Restaurant.
We strongly encourage those who were at the Forum Restaurant who have not contacted us yet to do so.

As you can see from one of the images, Suspects 1 and 2 appear to be walking together through the marathon crowd on Boylston Street in the direction of the finish line. That image was captured as they walked on Boylston in the vicinity of its intersection with Gloucester Street.


More at: http://www.fbi.gov/bostonbombings
Submit tips to: https://bostonmarathontips.fbi.gov