First draft cut of remarks given during FBI briefing (via Reuters' Scott Malone):



“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 to justice. Our collective law enforcement team has pursued thousands of leads and tips.



"As I said two days ago we are working methodically and with a sense of urgently 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, around the world as well as our partners in the Boston Police, ATF, Massachusetts State Police and more than 30 agencies of the Boston 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 fo the city of Boston, the commonwealth of Massachusetts and the country. Indeed, through that process 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 these two suspects. They are identified as suspect 1 and suspect 2. They appear to be associated. Suspect 1 is wearing a dark hat, suspect 2 is wearing a white hat. Suspect 2 set down a backpack at the site of the second explosion.



“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 the intersection with Gloucester Street. As you can see the quality of the photos is quite good. We will continue to work on developing additional images to improve their identification value.



“The photos and videos are posted for the public or media to use, review and publicize. For clarity these images should be the only ones, I emphasize the only ones, that the public should view to assist us. Other photos should not be deemed credible and they unnecessarily divert the public’s attention in the wrong direction and create undue work for vital law enforcement resources.



“For more than 100 years, the FBI has relied upon the public to be its eyes and ears. With the media’s help, in an instant these images will be delivered into the hands of millions around the world. We know the public will play a critical role in identifying and locating these individuals. Somebody out there knows these individuals as friends, neighbors, co-workers or family members of the suspects. Thought it may be difficult, the nation is counting on those with information to come forward and provide it to us. No bit of information, no matter how small or inconsequential is too small for us to see. Each piece moves us forward towards justice.



“We consider them to be armed and extremely dangerous. No one should approach them, no one should attempt to apprehend them except law enforcement. Let me reiterate that caution: Do not take any action on your own.