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Clinton's doctor examined the Democratic nominee at her home in New York and prescribed her antibiotics after the incident.

She appeared to faint as she was helped into her motorcade while her campaign team claimed she "overheated".

It comes less than two months before US voters elect their next president.

Hillary Clinton's campaign team said Clinton left the ceremony after feeling "overheated" but is now "feeling much better".

But Dr Lisa Bardack later examined Clinton at her home in Chappaqua, New York, and confirmed that she has pneumonia.

Dr Bardack said: "She was put on antibiotics and advised to rest and modify her schedule. While at this morning's event, she became overheated and dehydrated. I have just examined her and she is now re-hydrated and recovering nicely."

(Image: GETTY) (Image: GETTY)

Witnesses spotted and filmed Clinton as she was helped into a car while her knees buckled.

US journalist Rick Leventhal said: “Source tells me Hillary Clinton ‘clearly having some type of medical episode’.”

The unnamed security source said the 68-year-old Democratic nominee "had to be helped into her van by her protective detail" at the World Trade Center.

The source also told the Fox News journalist that Clinton's knees buckled and she had lost a shoe before being helped into the vehicle.

Clinton left the ceremony shortly before 9.37am, when a moment of silence was due to take place for the victims of the 9/11 attacks.

It marks the moment a plane flew into the Pentagon in 2001.

Family members of the 2,977 victims were reading through their loved one's names when Clinton made her hasty exit.

Last month there were claims Clinton had a weird episode on camera – sparking concerns she was having a seizure.

Conspiracy theorists have suggested Clinton was coughing up "alien eggs" in a campaign speech last week.

After the incident Clinton went to her daughter's home in New York.

She was later pictured outside her daughter's home smiling and waving to the cameras telling reporters she was "feeling great".

(Image: GETTY)

The journalist said on Fox News Live: "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 from Hillary Clinton.

"He said she was standing on a curb with her protective detail waiting for her motorcade.

(Image: FOX NEWS)

"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 underneath the van…

"The protective detail helped her into the van and the van took off, presumably in the direction of the hospital."

He added: "It's not terribly hot today. It was certainly warm at the scene."

Reports of ill health have been circulating around the presidential candidate for a number of weeks.

(Image: GETTY) (Image: GETTY)

Last week the candidate was filmed in a four minute coughing fit and appeared to spit out "green balls" in a campaign speech.

Clinton has rubbished theories that she is covering up an illness.

The incident came as Americans held a ceremony in New York on the 15th anniversary of the 9/11 attacks.

Republican presidential nominee Donald Trump also attended the ceremony and was near to Clinton.

Mr Trump has faced his own controversy as he denies bedding a 13-year-old girl.

The presidential nominee, who shared a platform with Ukip's Nigel Farage, has vowed to ban immigrants from terror-affected countries if he becomes US leader.