American football player Colin Kaepernick has again refused to stand for the national anthem as he continues his protest against the plight of black people in the US.

A week after staying seated during The Star-Spangled Banner, the San Francisco 49ers quarterback kneeled during the anthem before a match on Thursday.

Team-mate Eric Reid also protested, but they were booed by some in the crowd.

Kaepernick was joined by a former soldier who he met before the game.

Nate Boyer, a former staff sergeant with the US Army Special Forces, or the Green Berets, wrote an open letter to the quarterback last week.

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