Players who kneeled during the national anthem before the Cleveland Browns-Indianapolis Colts and the New England Patriots-Houston Texans games weren't supported by all fans in attendance.
Both sidelines at the Colts-Browns contest heard boos after groups of players protested during the anthem following President Donald Trump's remarks on Friday and Saturday.
In New England, a surprising number of fans lashed out against the Patriots who demonstrated - a group that included Tom Brady linking arms with teammates, while others took a knee. A cry to "stand up" could reportedly be heard from the crowd.