The annual general education meeting started off normally.

In a rented conference room, San Bernardino County Division of Environmental Health Services employees ate from a breakfast buffet and competed for gift cards in a trivia game. Supervisors gave out awards and played instructional videos.

The meeting was “mandatory fun,” one person later told the FBI.

As staff gathered in front of a Christmas tree for group photos, one employee slipped outside. When he returned, he and his wife wore masks and carried semiautomatic weapons. They opened fire, murdering 14 people, including 13 of his coworkers, and wounding 22 more. The couple died in a shootout with police hours later.

The Dec. 2, 2015 mass shooting at the Inland Regional Center in San Bernardino was the 13th deadliest in American

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