Many celebrities have taken part in nationwide protests this week.

Ellen Pompeo and TR Knight of Grey’s Anatomy participated in a Los Angeles protest on Wednesday.

Pompeo and Knight kneeled during the protest with TR holding a “Black Lives Matter sign.”

After the protest, Pompeo went on Instagram Live to point out an observation. She said, “We’re at a march for black lives, and we’re here to talk about the fact that they matter, and there’s machine guns — big ones — and aggression. The cops weren’t so aggressive, but their stance is aggressive; they’re on rooftops, they’re in cars, they’re in tanks, and I haven’t ever seen that show of force.”