Hillary Clinton mysteriously vanished from Sunday morning's 9/11 observances at ground zero after about an hour and a half, causing no shortage of tongues to wag about a "medical emergency." Clinton's camp was silent initially, then responded with this statement, reports CNN: "Secretary Clinton attended the September 11th Commemoration Ceremony for just one hour and 30 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." TMZ has video of Clinton appearing to stumble as she was helped into her van. Clinton emerged from daughter Chelsea Clinton's apartment, saying she was "feeling great;" the AP notes that her campaign was mum on whether she required medical attention. Clinton's rival, Donald Trump, was also at the 9/11 ceremony to observe the 15th anniversary of the attacks. (More Hillary Clinton stories.)