San Francisco 49ers' quarterback Colin Kaepernick was joined in his national anthem protest Sunday.
Kansas City Chiefs cornerback Marcus Peters raised his fist, four Miami Dolphins players knelt and other teams linked arms Sunday in protest.
Each protest came as the national anthem was played before the start of the various games.
Peters said Friday he salutes Kaepernick for his protest.
"It's not about attention for me, though," Peters told USA Today after the game. "Don't talk about it - be about it. I come from a majority black community from Oakland, California. I grew up around my people a lot. I got family who's still in the struggle. All I'm saying is we need to educate the youth. If we keep educating the kids, then we eliminate these problems."
Before kickoff in Seattle, Miami Dolphins' players Arian Foster, Michael Thomas, Jelani Jenkins and Kenny Stills knelt during the national anthem.
Seahawks team members collectively decided to interlock arms in a "demonstration of unity."
The Kansas City Chiefs did the same and released a statement explaining the move.
According to ABC News, Kaepernick and the 49ers are scheduled to play the Los Angeles Rams Monday, Sept. 12.
Coach Chip Kelly announced last weekend that Kaepernick will serve as the team's backup quarterback for Monday's game.