Anchored by Jake Tapper, The Lead airs at 4 p.m. ET on CNN.
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Reconstructing the Boston bombs could be key to the manhunt. Agents at the FBI lab in Quanitco, Virginia, are trying to rebuild the bombs that killed three and maimed so many at the Boston Marathon. They are looking for the virtual fingerprints of a terrorist.
Investigators found the twisted top of a pressure cooker on a roof, shredded pieces of what could be a backpack, and metal ball bearings. But whatever is missing could be key.
CNN's Tom Foreman is in the virtual studio with a look at the police work that could track down those responsible.