evidence: After their feisty debate, Vice President Kamala Harris and former President Donald Trump shared a decidedly more somber moment when they joined President Joe Biden and other dignitaries to mark 23 years since the Sept. 11 terror attacks. [...] Throughout the ceremony, six moments of silence were observed, acknowledging when each of the World Trade Center towers was struck and fell, and the times corresponding to the attack on the Pentagon and the crash of United Airlines Flight 93. [...] Tributes and gatherings across New York City and the Tri-State continued into the night, including on Staten Island, where Gov. Kathy Hochul attended the Postcards Memorial, to remember residents in that borough who were killed in the 9/11 attacks. Nearly a quarter of the New York firefighters killed that day were from Staten Island.