The FBI made an appeal for help finding two suspects in the Boston bombings in a press conference Thursday and revealed photos and videos of the two men. Special agent Richard DesLauriers explained that two men, one wearing a white hat and the other wearing a dark hat, were seen walking together toward the finish line of the marathon with black backpacks on—matching the types of bags found at the bombing site. The second suspect set down one backpack in front of a restaurant. Photos and videos of the suspects are being uploaded to fbi.gov, and the public and media are encouraged to study and spread the photos. The suspects are considered "armed and extremely dangerous" and only law enforcement officials should approach them. Anyone with information about the suspects is encouraged to visit bostonmarathontips.fbi.gov or call 1-800-CALL-FBI (1-800-225-5324).