British police is investigating a racist Brexit poster that demands residents of a council block to speak no other languages but English or leave the country.

The notice discovered on a fire door of council flats in Norwich was shared on Twitter after it was spotted by residents Friday morning before the Brexit deadline.

“As we finally have our great country back we feel there is one rule to that needs to be made clear to residents,” the notice said under the title “Happy Brexit Day.”

“We do not tolerate people speaking other languages than English in the flats.

Read more: UK: Racist Brexit poster asks people use English only