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U.S. Rep. Cori Bush has claimed on social media that white supremacists shot at protesters in Ferguson, Missouri, but the city’s police chief says he was unaware of any such incident.

Bush, a first-term Democrat, made her name as an activist leader in Ferguson after the fatal police shooting of 18-year-old Michael Brown on Aug. 9, 2014.

She posted on Twitter and Facebook on Monday that during the protests following Brown’s death, “white supremacists would hide behind a hill near where Michael Brown Jr. was murdered and shoot at us.”

Many people responded by questioning if that really happened.