A growing sentiment among Republican lawmakers is that the Boston Marathon bombing suspects did not act alone. They made the rounds on the Sunday talk shows, saying they believe Tamerlan and Dzhokhar Tsarnaev are part of a bigger terrorist plot. They believe the brothers had foreign help with training, or that a radical group may have pitched in to help finance the attack.

The circuitry of the bombs carry a certain signature that will help investigators uncover how the plot came together, said CNN contributor and former CIA operative Robert Baer.

Multiple reports indicate "the police are looking at this as a sophisticated device, which does not precisely follow the internet plans that are in "Inspire" magazine," said Baer, referring to al Qaeda's affiliate in Yemen's online English language magazine. "If that's the case, there's a master bomber out there."

The question is whether the mastermind is overseas, like in Dagestan, or in the United States.

"If he's in the United States, there's a chance he could strike again," said Baer. "I'm waiting for an FBI agent to step forward ... and tell me just how sophisticated this thing was."
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