(CNN) - Racial abuse is on the rise in post-Brexit Britain, a Conservative British MP said as police confirmed they were investigating several racially motivated crimes. Anti-immigrant leaflets saying "Leave the EU - no more Polish vermin" were put on cars near a school, local police said, the day after the country voted to leave the European Union. On Sunday, the Polish Social and Cultural Association in Hammersmith, west London, was allegedly vandalized with a racist slogan. Sou