FBI Now In Charge of Boston Marathon Bombing Investigation
The FBI is not yet speculating on a motive or a suspect for the explosions.
This attack is the first successful bombing in the United States since 9-11.
Bomb technicians are studying burn marks on concrete and bricks.
Doctors are collecting pieces of shrapnel from the victims to aid with the incestigation.
Officials believe that there were two small portable explosive devices, possibly hidden in a backpack.
One theory is that they were detonated remotely by a cell phone.
FBI officials are tracking multiple persons of interest, including a young man of Middle Eastern descent, who is being treated at a local hospital.
Other major US cities have tightened security in case there are more attacks.
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