Wed Nov 11, 5:00 AM ET

US President Barack Obama, seen here with his wife Michelle at the Fallen Hero Memorial at Fort Hood, has vowed justice as he eulogized those who were killed at the base and warned that even twisted faith could not explain such "craven" mass murder. US First Lady Michelle Obama (left) and President Barack Obama walk past the Fallen Hero Memorial at Fort Hood. (AFP/Paul J. Richards)

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