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When a masked, black-clad gunman stormed into a training session and holiday party for San Bernardino county health workers in December, only a handful knew instantly to run for the exits.

In a terrible twist of fate, some of the workers had previously been trained on how to deal with an active shooter in that very same conference room, according to a U.S. Department of Justice report released Friday about last year’s terrorist attack in San Bernardino.

They thought this must be more training and just stood there, until the carnage became starkly real.

A second assailant entered the room and joined the first, shooting anyone they could. In two to three minutes, they shot over 100 rounds, killing 14 people and wounding 22, in what was at the time the third deadliest attack in the U.S. since 9/11.

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