MSNBCW All In With Chris Hayes April 19, 2013
number two in a white hat. according to the fbi, this suspect, number two in the white hat is the only one authorities believe they have seen on tape planting an explosive device. they believe the two men were associated. anyone who knows anything about either of the men is asked to call 800-call-fbi or leave information at bostonmarathontips.fbi d.gs ov. the fbi emphasized they consider them a armed and dangerous and urged the public not to take action on their own, which seems like wise advice. joining me is pete williams. this is a big development. what's the latest? >> reporter: ...
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