CNN Erin Burnett OutFront April 16, 2013 23:34:00
There was gunpowder perhaps inside this pressure cooker, as we understand from law enforcement officials. what else do you know right now about the devices themselves that were used at the boston marath marathon? >> i think the important piece of evidence is that they are pressure cookers. why is that important? the 2010 times square bomber had a variation of it. remember the ieds are the vehicle of choice to be used by the terrorists. they have been used extensively in afghanistan and pakistan. so what's happening right now is the explosive materials found at the scene have been sent to quant...