Racist posters instructing apartment occupants to only speak English in their flats are being investigated by police in Norwich, UK.
All 15 levels of Winchester Tower received posters on Friday that said: "We do not tolerate people speaking other languages than English in the flats".
The 'Happy Brexit Day' flyers said residents who wished to speak their mother tongue should "return to that place...so they can let British people live here".
The apartment caretaker removed the posters. They included the text: "You won't have long till our government will implement rules that will put British first. So best evolve or leave".
Norfolk County police are testing the posters for forensic evidence after the attack was classified as "racially aggravated".
Apartment resident Toni Maguire and her neighbours staged an anti-racism protest outside their apartment block in response to the offending posters.
"We all thought it was absolutely disgusting," she said.
Norwich Council cabinet member Mike Stonard said he condemned the posters.
"Whoever put it there has committed a hate crime it is as simple as that."