Updated: Sept. 13, 2016 at 5:19 AM

NFL: Best of Week 1 (55 images)

With the 2016 NFL season is officially underway, here's a look at some of the best action from Week 1.

Pittsburgh Steelers safety Shamarko Thomas (29) helps to hold the American flag during the National Anthem prior to their game against the Washington Redskins at FedEx Field in Landover, Maryland on September 12, 2016. Photo by Kevin Dietsch/UPI

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San Francisco 49ers QB Colin Kaepernick (7) kneels alongside teammate Eric Reid during the National Anthem before playing the Los Angeles Rams at Levi's Stadium in Santa Clara, California on September 12. 2016. Kaepernick and Reid are kneeling In a protest of racial injustice. Photo by Bruce Gordon/UPI

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Baltimore Ravens nose tackle Brandon Williams (98) waves a U.S. flag to remember the 911 terrorist attacks before opening an NFL game against the Buffalo Bills at M&T Bank Stadium in Baltimore, Maryland, September 11, 2016. Photo by David Tulis/UPI

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Pittsburgh Steelers running back DeAngelo Williams (34) brings in a pass against Washington Redskins linebacker Will Compton (51) at FedEx Field in Landover, Maryland on September 12, 2016. Photo by Kevin Dietsch/UPI

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