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Democratic presidential candidate Hillary Clinton, second from right, departs after attending a ceremony at the Sept. 11 memorial, in New York, Sunday, Sept. 11, 2016, on the 15th anniversary of the Sept. 11 attacks. Image Credit: AP

NEW YORK: Democratic presidential candidate Hillary Clinton made an early departure Sunday from a remembrance ceremony on the 15th anniversary of the 9/11 attacks after feeling "overheated," but was later doing "much better," her campaign said.

The incident will no doubt make waves on the White House campaign trail, as her Republican rival Donald Trump has repeatedly claimed that the former secretary of state, 68, was temperamentally and physically unfit to be president.

"Secretary Clinton attended the September 11th Commemoration Ceremony for just an hour and thirty minutes this morning to pay her respects and greet some of the families of the fallen," her campaign said in a brief statement.

"During the ceremony, she felt overheated so departed to go to her daughter's apartment, and is feeling much better."

Fox News reported, citing a law enforcement source, that Clinton appeared to have suffered a "medical episode" as she boarded her van to leave Ground Zero.

Trump was also in attendance at the 9/11 ceremony, though both candidates are not formally campaigning on Sunday.