New York City Mayor Bill de Blasio speaks to US Democratic presidential nominee Hillary Clinton during a memorial service at the National 9/11 Memorial September 11, 2016 in New York. Bremdam Smialowski /AFP/Getty Images

Presidential candidate Hillary Clinton felt “overheated” during a commemoration ceremony for the victims of the Sept. 11 attacks and left after an hour and 30 minutes, according to a campaign spokesman.

“During the ceremony, she felt overheated so departed to go to her daughter’s apartment, and is feeling much better,” spokesman Nick Merrill said in a statement.

The ceremony at the Sept. 11 memorial plaza at the World Trade Center site marked the 15th anniversary of the attacks. Merrill said that Clinton attended “to pay her respects and greet some of the families of the fallen.”

She departed without warning, as NPR’s Tamara Keith tells our Newscast unit. “Her traveling press corps was not taken with her and didn’t know her whereabouts for quite some time,” she says.

Tamara adds: “This comes less than a week after Clinton had a coughing fit at a rally in Cleveland. She said she was suffering from seasonal allergies.”

According to the National Weather Service, the temperature was 79 degrees with 54 percent humidity at 9:51 a.m. in Manhattan.

Donald Trump also attended the commemoration.