Democratic presidential nominee Hillary Clinton unexpectedly left a 9/11 memorial service in New York today after her campaign said she became "overheated."

Clinton retreated to her daughter Chelsea's nearby apartment and later left for her own New York-area home.

There's more, however. A video posted on  Twitter appears to show Clinton struggling to walk as she was led to a van for the trip to her daughter's apartment. The Associated Press reports:

Clinton's campaign says the former secretary of state left the annual remembrance event on Sunday after feeling "overheated." She retreated to her daughter's apartment. She left a short time later, saying she was "feeling great."

Clinton spent 90 minutes at the ceremony before leaving.

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