Democratic presidential nominee Hillary Clinton felt "overheated" and left the ceremony commemorating the 15th anniversary of the Sept. 11, 2001, attacks at the former site of the Twin Towers in New York on Sunday.
Clinton went to her daughter Chelsea's apartment. Later, she said, "I'm feeling great."
The former U.S. senator from New York spent about 90 minutes at the memorial in lower Manhattan before an abrupt departure just before 9:30 a.m. Campaign aides didn't respond to questions about her whereabouts until spokesman Nick Merrill released a statement at 11 a.m., just as the ceremony ended, saying she was feeling "much better."
Republican nominee Donald Trump also appeared at the event. He and Clinton were about 20 feet apart from one another and didn't interact while names of the victims were read by their relatives. Trump left shortly after 10:30 a.m.
During the 90 minutes of quiet from the Clinton campaign, a Fox News reporter posted a handful of tweets citing a law enforcement source who said that Clinton had experienced a "medical episode," adding fuel to speculation about Clinton's health dating back to a 2012 concussion, which Trump and others on the right have been using to sow doubts about her fitness to be commander-in-chief.
The concussion came after Clinton, then secretary of state, "suffered a stomach virus after traveling, became dehydrated, fainted and sustained a concussion," according to a letter released by her personal physician in July 2015.
The letter said Clinton, 68, "is in excellent physical condition and fit to serve as president of the United States."
(Jennifer Epstein and Kevin Cirilli contributed to this report.)
