The series of 11 photos on the FBI website includes this advisory:
If you have visual images, video, and/or details regarding the explosions along the Boston Marathon route and elsewhere, submit them on https://bostonmarathontips.fbi.gov/. No piece of information or detail is too small.
You can also call 1-800-CALL-FBI (1-800-225-5324), prompt #3, with information.
All media inquiries should be directed to the FBI’s National Press Office at (202) 324-3691.
Here's the video with the photos: