LIVE CBS Coverage: Boston Explosions

At least two people are dead from explosions near the finish line of the Boston Marathon on Monday.

Reuters said two high-level U.S. law enforcement sources told them one or more bombs were responsible for the detonations. At least one more device has been discovered by police.

Two explosions happened at about 2:45 p.m. ET, nearly three hours after the first of the event's winners crossed. Police announced 28 have been injured in addition to the dead, according to CNN.