The FBI is now releasing photos of two suspects wanted in connection with the Boston Marathon bombings.
Two men, both with backpacks, heading to the finish line. One has a white hat, the other a dark hat.
Special Agent in charge Richard Delaurier says the men should not be approached.
"If you see these men, contact law enforcement. If you know anything about the bombings, or the men pictured here, please call the telephone listed on the photo arrays, that's 1-800-CALL-FBI. Again that's 1-800-225-5324. All calls will be kept confidential."
The blast killed three people, including an eight year old boy.
