NEW YORK -- A video taken by a bystander shows Hillary Clinton wobbling and being held up by three people as she left a ceremony at the World Trade Center marking the 15th anniversary of the Sept. 11 attacks.
Clinton's campaign says the Democratic presidential nominee left the ceremony in New York early after feeling "overheated."
The video showed her stumbling while getting into a van.
A senior law enforcement official who was briefed on the matter said Clinton was observed "fainting." That official spoke on condition of anonymity, because he wasn't authorized to disclose information publicly.
A few hours later, Clinton walked out of daughter Chelsea Clinton's apartment on her own, saying she was "feeling great."
She waved and posed for a photo with a young girl before getting into her motorcade.
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