The Polish Embassy in London has said it is "shocked and deeply concerned" by alleged incidents of xenophobic abuse directed against the Polish community, in the wake of the Brexit vote.
A number of incidents have been reported including two cases in Hammersmith in London and Huntingdon, Cambridgeshire, which police are investigating.
On Saturday, laminated cards reading "Leave the EU - no more Polish vermin" were allegedly delivered to members of the Polish community in Huntingdon.
Scotland Yard has said it is investigating after reports of "racially motivated criminal damage" at the Polish Centre in Hammersmith. Police have also increased patrols in the area.
Andy Slaughter, the Labour MP for Hammersmith, tweeted that he was disgusted by the "outrageous act".
In a statement, the Embassy of the Republic of Poland, urged all nationals "who fall victim of xenophobic abuse and on all witnesses to report such incidents".
The Polish Ambassador to Britain, Witold Sobkow, has also urged politicians to condemn what he described as "hate motivated acts".