Relatives of three Americans killed in drone strikes in Yemen are suing top Pentagon and CIA officials, saying the killings were unconstitutional.
Cleric Anwar al-Awlaki and Samir Khan died in September. Awlaki's son Abdulrahman, 16, died in October.
Relatives accuse Defence Secretary Leon Panetta, CIA Director David Petraeus and two military commanders of approving and directing the strikes.
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