Hillary Clinton has laughed off any rumors that her health is in jeopardy but at the 9/11 memorial in New York City on Sunday, the Democratic nominee had a serious "medical episode" and had to be rushed away.

Several sources at the scene said that Clinton looked like she almost fainted, had to receive assistance getting into a van, and her staff tried to block the media from taking any pictures.

Cops on scene telling me "tension is very thick" among #Hillary staffers following #HillarysHealth episode. No info available. — John Cardillo (@johncardillo) September 11, 2016

BREAKING: Eyewitness reports Hillary Clinton left 9/11 memorial ceremony in New York after 'medical episode' — Oliver Duggan (@OliDuggan) September 11, 2016

law enforcement source confirms to me as well that @HillaryClinton left 9/11 ceremony because she wasnt feeling well https://t.co/JesYuGmG0P — Tamara Gitt (@tamaragitt) September 11, 2016

Two senior law enforcement sources tell NBC News that Hillary Clinton fell ill and may have fainted at the 9/11 Memorial. — Kyle Griffin (@kylegriffin1) September 11, 2016

MORE ON #HILLARY per witness: "unexpected early departure"; she stumbled off curb, "knees buckled", lost a shoe as she was helped into van — RickLeventhalFoxNews (@RickLeventhal) September 11, 2016

Source: "#Hillary began to pass out and was caught by security detail. Went limp. Lost shoes. Put her in van head first." #HillarysHealth — John Cardillo (@johncardillo) September 11, 2016

From NBC Pool Report: "We are told by the campaign that we are no longer allowed to shoot anything from the ceremony." — toddstarnes (@toddstarnes) September 11, 2016

From NBC Clinton pool report: "We are being kept completely in the dark." — toddstarnes (@toddstarnes) September 11, 2016

BREAKING NEWS: @HillaryClinton reportedly leaves 9/11 Memorial early because of 'medical episode.' pic.twitter.com/pj0co4lstE — Fox News (@FoxNews) September 11, 2016

UPDATE: Clinton's campaign said that the Democratic nominee just felt overheated and left to go to Chelsea's apartment.

Clinton campaign says "during ceremony she

felt overheated so departed to go to her daughter's apartment" - via pool pic.twitter.com/sOBi27Qoqs — Dan Roberts (@RobertsDan) September 11, 2016

UPDATE 2: Video has emerged of her fainting.