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Wednesday, September 11th
Hundreds of first responders and other participants walk the stairs during the Tower Challenge remembering the 9/11 terrorist attack victims at Gila River Arena Wednesday, Sept. 11, 2019, in Glendale, Ariz. Participants recreated the 110 flights of stairs (2071 steps) climbed by New York City Firefighters and other first responders during the attacks on the World Trade Center. (AP Photo/Ross D. Franklin)