UPDATE 8:58P.M.: Boston police: At least 3 people killed in marathon bombing.
UPDATE 8:05P.M.: BOSTON (AP) - Authorities say bombs that exploded near the finish line of the Boston Marathon have killed two people and injured more than 120.
Eight hospitals report that they are treating at least 124 people. Of those, at least 15 are in critical condition.
The injuries ranged from cuts and bruises to amputations. Many victims suffered lower leg injuries and shrapnel wounds. Some suffered ruptured eardrums.
Dr. Richard Wolfe, chief of the department of emergency medicine at Beth Israel Deaconess Medical Center, says one or two of the hospital's 21 patients faced a "high probability of mortality."
UPDATE 5:15P.M.: Officials have ruled that the incident at the Boston Public Library was NOT connected. They're saying it was an accidental fire.
UPDATE 4:57P.M.: A third explosion at the Boston Public Library has been confirmed and officials are treating it as if it were connected to the first two. No injuries have been reported.
UPDATE 4:23P.M.: Intelligence official: 2 more explosive devices found at Boston Marathon; being dismantled.
ORIGINAL 3:22P.M. At least two people have died and another 23 are injured from an explosion near the finish line of the Boston Marathon, according to the Boston Police Department.
Organizers say that two bombs caused the explosion near the Fairmount Copley Plaza Hotel. Race officials locked down the hotel because of the report.
The sound of two booms, which sounded like thunder, had come a short time earlier.
CBS News is doing live coverage and we'll update this story as we get more information.
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