Hillary Clinton was forced to leave a 9-11 ceremony in New York today because she felt ill, as a video posted on Twitter showed her being helped into a van by her staff and security.

This is a second angle of that incident, which seems to be a cell phone video that was recording from another screen:

Clinton was taken to her daughter's apartment in New York; she emerged from there later in the morning and told reporters she was feeling fine.

Clinton's campaign said she 'overheated' at the 9-11 event. It was not that hot in New York today, but it was humid this morning, before cooler and less humid weather moved through along the East Coast.

Clinton then returned to her home in Chappaqua, New York. The campaign did not provide immediate details on whether she would see a doctor or what exactly happened to her - but the incident seemed certain to raise issues again about her health, which Clinton at times has laughed off.