San Francisco 49ers players Colin Kaepernick, Eric Reid and Eli Harold kneeled during the national anthem before the game Sunday in Seattle.
The Seahawks stood together with their arms locked during the anthem, just as they did in their first two games this season.
Seattle held a moment of silence before the anthem for the victims of a mass shooting on Friday night about 90 minutes north of Seattle, where five people died.
At the Steelers-Eagles game in Philadelphia, Eagles safety Malcolm Jenkins and cornerback Ron Brooks were the only players from either team to raise their fists during the national anthem. Last week, they were joined by Marcus Smith and Steven Means.
Three players on the Chargers sideline in Indianapolis had their hands raised during the anthem, including offensive lineman Joe Barksdale and Chris Hairston. Colts cornerback Antonio Cromartie, a former Charger, took a knee and also raised his fist.
In Tampa Bay, a moment of silence was held before the Rams-Buccaneers game for ace Marlins pitcher Jose Fernandez, who was killed in a boating accident early Sunday.
