Featured photo by Kevin Donovan.
This Storify has updates, photos, videos and social media posts about the explosion near the finish line of the Boston Marathon.
Details in AP story.
AP reported cellphone service in Boston has been shut down in Boston to prevent detonations of explosives.
Google has a Person Finder page up for the Boston bombing.
AP reported two more explosive devices have been found and are being dismantled.
FAA has placed a flight restriction over the site.
BYU student Parker Murray, participant of marathon has been confirmed safe.