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BBCUp to eight US army officers face disciplinary action over the behaviour of a major accused of a shooting spree, officials quoted by US media say.
Thirteen people died when psychiatrist Major Nidal Hasan opened fire at the Fort Hood base in Texas last November.
According to an inquiry, Maj Hasan's previous behaviour should have sounded alarm bells, the unnamed officials say.
Defence secretary Robert Gates has said that army superiors must be "attuned to personnel who may pose a danger".
"Failure to do so, or kicking the problem to the next unit, may lead to damaging or even devastating consequences," he warned, after reading a Pentagon report on the incident.
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