December 27, 2013
States in multiple locations, including trying to conduct attacks against the u.s. homeland, especially by taking down aircraft. >> reporter: analysts say the group rebounded in 2013 from battlefield losses. u.s. drone strikes have had mixed results. inside syria, a key al qaeda affiliate, also stronger than a year ago. about 100 americans, along with potentially hundreds from europe, are fighting alongside thousands of militants. >> if they were able to return to europe and get access to the un...