The mother of protester Heather Heyer, who was killed in the 2017 Charlottesville white supremacist rally, has a message for attendees of an upcoming pro-gun demonstration: “To anybody planning violence, stay the hell away from Richmond.”

Susan Bro’s warning, delivered via UK newspaper The Independent, came after the FBI arrested multiple suspected neo-Nazis who discussed shooting up the planned Monday demonstration.

Bro’s daughter was killed while counter-protesting at the 2017 Unite the Right rally when Nazi sympathizer James Fields mowed her down with his car.

Thousands are expected at the Virginia capitol for Monday’s rally, which comes days after Virginia legislators passed a sweeping gun control package.

Bro, who said she is a gun owner and doesn’t support parts of the new measures, expressed concern about an “incitement of violence” ahead of the annual Lobby Day demonstrations.

“I just think everyone needs to take a moment and breathe,” she said. “But I think we’re past that point.”

On Wednesday, Virginia Gov. Ralph Northam declared a state of emergency and banned all guns from Capitol Square after receiving “credible threats” ahead of the rally.

The FBI arrested three suspected white supremacists this week in Delaware and Maryland who were allegedly floating plans to target the rally.