5:40 p.m. (EST): Boston police have denied earlier reports from The New York Post (see below) that a suspect was in custody. "At this time, we haven't been notified of any arrests or anyone apprehended," said a spokesperson. "Honestly, I don't know where they're getting their information from, but it didn't come from us."

5:30 p.m.: The New York Times published an overhead map showing the exact locations of the two explosions, which were about 550 feet from each other and occurred about 20 seconds apart.

If you are looking for a person in Boston or would like to report information you have about someone in Boston, Google has set up a Person Finder.

4:55 p.m.: At a press conference that just concluded, Boston Police Commissioner Ed Davis said that a third explosion, this one at the JFK Library a few miles away from the marathon site, was related to the explosions on Boylston Street. However, the JFK Library is saying that any connection to the first two explosions is "pure speculation," that everyone is fine and the fire is contained.

4:40 p.m.: The New York Post is reporting that Boston police are guarding a suspect in the hospital, as well as a rise in the death toll to 12 and the injury toll to 50.

4:30 p.m.:
4:10 p.m.:confirmed

4 p.m.: Multiple sources are now reporting that three people were killed by the blasts. The Boston Police Department has confirmed two of those deaths, as well as 23 injuries.

Below is video of both explosions in succession, via The Boston Globe:

Shortly before 3 p.m. on Monday, two explosions occurred near the finish line of the Boston Marathon. Windows and storefronts were blown out, and there are reports of dozens of injuries.

The two explosions happened moments apart, according to witnesses. The annual race is one of the most popular marathons in the country, drawing thousands of attendees, many of whom gather at the finish line.

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This post will be updated as more information comes in.

Live video from the scene can be found here.

[WCVB]