Players, following the lead of former National Football League quarterback Colin Kaepernick, say they kneel to protest social injustices, particularly against African-Americans.
The protest comes in the wake of some controversial comments from the Texans owner.
Houston Texans players, stung by team owner Bob McNair's remarks while discussing the NFL's national anthem demonstrations, knelt for "The Star-Spangled Banner" before their game in Seattle on Sunday.
The league-wide protests began early in the 2016 season when Colin Kaepernick made a decision to take a knee during the national anthem to protest police brutality and inequality against minorities.
McNair issued an apology on Saturday, essentially stating that he's bad at metaphors.
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McNair, who first apologized in a statement on Friday, released a second statement regarding his comments on Saturday. It was reported that team was planning on making a gesture before the Week 8 game against the Seattle Seahawks in response to the comments.
Texans left tackle Duane Brown told reporters that he was "sickened" by McNair's words. "We put our bodies and minds on the line every time we step onto that field, and to use an analogy of inmates in a prison, I'd say that's disrespectful".
As the anthem began, Texans players looked around at each other and then the majority knelt in unison.
Video posted on twitter showed most of the team kneeling on the sideline and linking arms.
Members of the Houston Texans kneel during the national anthem before the game against the Seattle Seahawks at CenturyLink Field on October 29, 2017, in Seattle, Washington.