The vote for Brexit has been blamed for a spate of racist attacks over the weekend - including “no more Polish vermin” cards posted through letter boxes and allegedly racist graffiti daubed across a Polish cultural centre.

Baroness Warsi suggested that the “divisive and xenophobic” Leave campaign bore responsibility for the "problems on our street", adding that a series of "really disturbing" hate crimes had taken place since the vote for Brexit.

Cambridgeshire Constabulary were investigating reports that laminated signs reading "Leave the EU - no more Polish vermin" had been posted to members of the Polish community in Huntingdon.

Detective Superintendent Martin Brunning said: “The production and distribution of this and any other similar material is committing the crime of inciting racial hatred,” adding that it carries a maximum sentence of seven years in prison.

The Polish President’s spokesman said the posters were “pure racism” and demanded that Boris Johnson and Nigel Farage condemn “this outrageous barbarity”.