2:45 p.m. (EST): The Boston Police Department has announced that "there has not been an arrest in the Marathon attack." Investigations are ongoing.

2:35 p.m.: CNN is retracting their previous report that an arrest has been made in the Boston Marathon bombings. Other sources are reporting that officials are close to identifying a suspect after reviewing area surveillance video, but no arrests have been made.

CNN is reporting that a federal law-enforcement source says that footage from a department store camera near where the second explosion occurred may have led to the major breakthrough.

Nothing official has been announced yet, but a press conference has been scheduled for later this afternoon.

This post will be updated as more information comes in.

[CNN, AP]