The Democratic presidential nominee’s “knees buckled” as she left the event before it ended and was helped into a van.
US journalist Rick Levanthal of Fox News said: “She unexpectedly left early because of what appeared to be a medical episode.
“I have a law enforcement source who was there, who was 15 feet away form Hillary Clinton. He said she was standing on a curb with her protective detail waiting for her motorcade.
“They were surprised to see her because she wasn’t meant to be leaving yet.
“When it finally rolled up my source said she stumbled off the curb, appeared to faint, lost one of her shoes, which wound up under the van.”