FBI appeals for help solving marathon bombings
BOSTON (AP) — A bomber may have been seen amid the Boston Marathon revelers carrying an unusually heavy nylon bag, weighed down with shrapnel-packed explosives, the FBI has suggested. Or perhaps someone heard something beforehand as a culprit tested explosives or expressed an interest in attacking the race.
Source: http://news.yahoo.com/fbi-appeals-help-solving-marathon-bombings-063647693.html