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structures as well as overseas. >> the group in yemen well known for the failed underwear bomber attempt to bring down an airplane christmas day 2009. four years later, the u.s. intelligence community believes it poses the greatest threat of an attack on the u.s. >> they're capable of plotting attacks against the united states in multiple locations including against the u.s. homeland especially by taking down aircraft. >> analysts say the group rebounded in 2013 from battlefield losses. u.s. drone strikes have had mixed results. a drone attack this month failed to kill an al qaeda planner believed to be behind a plot to attack the u.s. embassy. yemen says more than a dozen members of a wedding party were killed in that attack.