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COMMERCE CITY, Colo.—Authorities are trying to locate the source of a mysterious vapor cloud that made a group of senior citizens sick.
The group was about to board a bus at a recreation center on Sunday to go listen to children sing Christmas carols when they started choking.
Commerce City police commander Dennis Moon tells KUSA-TV () the vapor cloud was gone by the time emergency teams arrived.
No serious injuries were reported, but some people still felt sick on Monday.
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Information from: KUSA-TV,
