This will be the last update of this article this afternoon. There is a press conference with the FBI at 5P, after which we'll publish a new article recapping the details. What we do know as fact is that the FBI and has made "significant progress" in this investigation.

UPDATE @ 3:02:

The Boston police department has tweeted that there HAS NOT been an arrest made:

UPDATE @ 2:51:

CBS News is reporting that the suspect is a WHITE MALE not 'dark skinned' as previously reported by other outlets:

Additionally CBS News is reporting that cellphone tower data was used to find the bomber:

AP just tweeted that "Federal officials deny that Boston Marathon bombing suspect is in custody." - however AP has NOT retracted that their source confirms so.

ABC News also has NOT reported an arrest:

UPDATE @2:29: We have conflicting reports. NBC is saying that a top official in Boston says that there is NO arrest:

However, a source at the Boston Globe continues to state that a suspect is in custody:

UPDATE @2:21: This is helicopter footage of the Federal Courthouse in that is from Twitter - AP and CNN are reporting that the suspect has been brought here. However, someone can be taken into custody without there being an arrest. No officials have made a statement regarding a suspect in custody and we are reporting based on information from CNN and the Associated Press.

UPDATE @ 2:06 PM: The AP reports that Federal Marshals have a suspect in custody and are brining him to a Federal Courthouse:

UPDATE AT 1:49: CNN REPORTS THAT A SUSPECT HAS BEEN ARRESTED AND IS IN CUSTODY.

Associated Press is also reporting that an arrest has been made:

According to reports on major national media, CNN has broken the story that the FBI has obtained clear footage of a suspect in the Boston bombings. The footage originated from a department story surveillance camera and was used to locate other footage that included images of the suspect from a Boston TV station.