More than 20 people may be missing or unaccounted for after a major flash flood tore through a remote area of the Grand Canyon, prompting an urgent public plea from the National Park Service..

Grand Canyon National Park said 62 people had been evacuated as of Sunday morning from Bright Angel Canyon and the Phantom Ranch area, where significant flooding hit on Aug. 29.

Officials are asking for the public’s help to account for more than 20 people who may have been in the affected area during the flood.

“Additional evacuations are planned today,” the park said, warning that more thunderstorms and heavy rain are possible Sunday and Monday, raising…

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