UPDATE, 7:15pm EST: After a whirlwind of conflicting reports, and a heavy dosage of mockery directed at CNN, here is where things sit: there is no suspect currently being held in the Boston Marathon bombing, but authorities have made significant progress using video from a Lord & Taylor store between the two bombings. Whether that translates into a successful apprehension remains to be seen.
UPDATE, 2:40pm EST: The reports are suddenly ambiguous. CNN is now hedging its previous statement that a suspect had been arrested. The AP is saying that a suspect is in custody and is being taken to court. CBS News said a suspect has been identified but not arrested. The AP has a better track record than CNN with this sort of thing, but we shall see who has this story correct.
UPDATE: The AP is reporting that federal marshals will take the Boston Marathon bomber suspect into custody and keep him or her at a Boston courthouse. An official news briefing is scheduled for later today.
The suspect was spotted on a surveillance video from a Lord & Taylor store between the two blasts.
Authorities are reporting that they have identified a suspect in the Boston Marathon attack on Monday, which killed three people, and injured over 170. We don't know yet whether this was foreign or domestic terrorism, but key pieces of evidence have come together to indicate one person.
Authorities studied video from a department store near the second explosion. A Boston television station also provided helpful footage. A lid from a pressure cooker thought to have been used in the attack (the bombs were IEDs comprised of pressure cookers filled with sharp metal objects) was found on the roof of a nearby building.
Authorities are being understandably tight-lipped for now. We will update this story as more information becomes available on the suspect in the Boston Marathon attack.