Anheuser-Busch InBev NV, one of the biggest sponsors of pro football, sent a stern warning to the National Football League, saying it was "increasingly concerned" by reports of domestic violence by some of its players and that it wasn't satisfied with the NFL's handling of the controversy.

The statement—the strongest remarks yet from an NFL sponsor—follows calls on social media for boycotts of NFL sponsors, which include CoverGirl and Pepsi as well as AB InBev's Bud Light.

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