NFL players raised their fists or took a knee as the national anthem was played before football games around the country on the 15th anniversary of the Sept. 11 terrorist attacks.
As "The Star Spangled Banner" played at football games around the country on 9/11, athletes joined in the protest started last month by San Francisco 49ers quarterback Colin Kaepernick.
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Marcus Peters, a cornerback for the Kansas City Chiefs, held is right fist in the air during the national anthem before Sunday's football game against the San Diego Chargers.
John Sleezer / AP