Hillary Clinton was required to leave a ceremony commemorating 9/11 due to a "medical episode," a law enforcement source who witnessed the event reportedly told Fox News. The source said that the Democratic nominee seemed to faint as she entered her van and was helped by her security convoy. Fox cited a witness who said Clinton stumbled off the curb while her "knees buckled" and also lost a shoe while being helped into the van. The report was independently verified, and US media reported that Clinton's aides had not initially responded to questions from the press on the matter. The commemoration ceremony held in New York kept with tradition that began in 2012 with no public officials set to speak at the ceremony, with both Clinton and Donald Trump attending among other dignitaries. "We'll never forget the horror of September 11, 2001," Clinton said briefly. "Let's honor the lives and tremendous spirit of the victims and responders." Last Monday, Clinton said that she was not distracted by rumors of ill health and that attacks on the Clinton Foundation were not rooted in fact. Opinion polls have recently tighten between Clinton, the former secretary of state and US senator, and Trump, a New York businessman, ahead of the November 8 election.