Hillary Clinton unexpectedly left Sunday's 9/11 anniversary ceremony in New York after feeling "overheated", according to her campaign team.
Clinton's spokesman Nick Merrill said in a statement that she attended the morning ceremony for 90 minutes "to pay her respects and greet some of the families of the fallen" but that "during the ceremony, she felt overheated so departed to go to her daughter's apartment, and is feeling much better."
There were no other details given, like whether she needed medical attention.
A senior law enforcement official who was briefed on the matter said that after leaving the memorial plaza, Clinton was observed "fainting" in a departure area.
Footage apparently taken by a bystander at the ceremony appears to show Clinton wobbly on her feet as she is ushered into a car.
But she was all smiles as she walked out of her daughter Chelsea's apartment building in Manhattan just before midday (US time) and told reporters that she was "feeling great".
Donald Trump supporters have tried to make the case that she is physically unfit for the White House, citing a concussion she sustained in December 2012 after fainting. Her doctor attributed the episode to a stomach virus and dehydration.
It's just funny because in 2012 it was "Clinton is faking being sick" and now it's "Clinton is secretly very sick." pic.twitter.com/CeSX8ZiZ9j
-- andrew kaczynski (@BuzzFeedAndrew) September 11, 2016