Video Shows Hillary Clinton Collapse As She's Rushed From 9/11 Memorial Service

This is the moment Hillary Clinton collapsed as she was led away from a September 11 memorial service because she became "overheated."

The presidential candidate arrived in New York City to pay her respects on Sunday.

But she quickly became unwell and left around an hour and a half later.

Footage has emerged showing her stumble on her feet as she waits to get into a car.

Clinton is surrounded by her aides when she appears to faint and fall toward the vehicle door.

A spokesperson for Clinton said she became "overheated" while attending the service and was taken to her daughter's nearby apartment in the Flatiron District.

A statement from her campaign read,

Secretary Clinton attended the September 11th Commemoration Ceremony for just an hour and thirty minutes this morning to pay her respects and greet some of the families of the fallen. During the ceremony, she felt overheated so departed to go to her daughter's apartment, and is feeling much better.

Services were held across the world to mark the 15th anniversary of 9/11.

President Obama led a moment of silence at the White House at 8:46 am. The day before, he said,

We're still the America of heroes who ran into harm's way, of ordinary folks who took down the hijackers, of families who turned their pain into hope. We are still the America that looks out for one another, bound by our shared belief that I am my brother's keeper, I am my sister's keeper. In the face of terrorism, how we respond matters.

Meanwhile, people have been sharing where they were the moment they found out a plane had flown into the North Tower on Twitter.

The most chilling accounts come from those who were too young to understand the harrowing events unfolding in New York City.