Hillary Clinton had a “medical episode” that required her to leave a 9/11 commemoration ceremony early, a law enforcement source who witnessed the event told Fox News.

Clinton “appeared to faint on her way into her van and had to be helped by her security” and was “clearly having some type of medical episode.”

Clinton’s stumbled off the curb, her “knees buckled” and she lost a shoe as she was helped into a van during her “unexpected early departure,” a witness told Fox News.

CBS News reports the pool of reporters who travel with Clinton “are being penned in at 9/11 memorial, not informed of her current whereabouts.”

NBC News confirms that two law enforcement officials say Clinton “fell ill and may have fainted.”

According to CBS News, the Clinton campaign says, “During the ceremony, she felt overheated so departed to go to her daughter’s apartment, and is feeling much better.”