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

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