Lone wolf does not automatically mean home grown right wing anti govt type. Remember Hasan acted alone in his terrorist attack. Oh wait, that was just workplace violence, never mind.
I'm thinking more of along the lines of a dryer timer/kitchen timer as a trigger device, drop it a trashcan/mailbox and forget it. It would prevent a jamming device from holding up your plan. It could've also beeen a command det (suicide), you have 2 bombs and 2 deaths beside the kid.
second fatality is confirmed as a 29-year-old restaurant manager.
http://www.cbsnews.com/8301-201_162-57579886/second-fatality-identified-in-boston-marathon-bombings/
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