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FBI takes over investigation into Boston bombings

BOSTON   --  The FBI is now in charge of the investigation into the Boston Marathon double-bombings.
Authorities this morning are pouring over this dramatic video footage from the finish line -- for clues.

Bomb technicians are studying burn marks on bricks and concrete.
And at hospitals, doctors are collecting pieces of shrapnel that were blasted into bodies.
But they are not speculating yet on a motive or who may have carried out the  explosions.

"They're going to look at the components of the bomb, they're going to be able to tell is this someone who just put this together over the internet or
 Is this a bomb maker."

Officials believe these were two small, portable devices possibly hidden in a backpack.
One working theory: They were remotely detonated by a cell phone.