United Airlines says no mechanical or technical problems were found after a plane headed to Los Angeles from Denver made an emergency landing in Grand Junction, Colorado, on Wednesday.
Spokeswoman Jennifer Dohm says flight attendants alerted the captain of the Airbus A320 that several passengers reported feeling ill, and the captain decided to deploy oxygen masks as a precaution in case cabin pressurization was an issue.
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The plane landed safely, and one passenger was treated at a hospital and released. Others continued to Los Angeles on a different plane.
Grand Junction Fire Department spokesman Shawn Montgomery says firefighters tested for toxic gases and no problems were found.