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SARALAND, Ala. — An Alabama police department says it’s investigating after video showed a black woman being knocked down by police and arrested inside a restaurant.

The NAACP is calling the arrest troubling, and pickets stood outside the restaurant with signs.

A statement from the Saraland Police Department says the city’s public safety director and mayor are aware of the arrest and video, which gained traction on social media following a confrontation inside a Waffle House restaurant on Sunday.

Video posted online shows officers arguing with a woman and then wrestling her to the floor as diners look on. Three officers are visible in the video.

It’s unclear from the video what caused the dispute, but Mobile-area media quote witnesses as saying the woman objected to being charged for plastic eating utensils.