Reported incidents of racism have seen a sharp increase since the result of Britain's Brexit referendum.
The attacks include graffiti on walls, cards printed with racist slogans being delivered to mailboxes and personal accounts of xenophobic verbal abuse.
Figures suggest a 57 percent increase in reported hate crime incidents, triggering condemnation from several politicians including outgoing UK Prime Minister David Cameron and London Mayor Sadiq Khan.
"In the past few days we have seen despicable graffiti daubed on a Polish community centre, we've seen verbal abuse hurled against individuals because they are members of ethnic minorities," said Mr Cameron.
"Let's remember these people have come here and made a wonderful contribution to our country. We will not stand for hate crime or these kinds of attacks, they must be stamped out."
"It's really important we stand guard against any rise in hate crimes or abuse by those who might use last week's referendum as cover to seek to divide us," said Mr Khan.
"I've asked our police to be extra vigilant for any rise in cases of hate crime, and I'm calling on all Londoners to pull together and rally behind this great city."
Accounts of harassment in British streets include ethnic minorities having "we voted Leave, now leave" and "go back home" yelled at them.
The Polish embassy released a statement saying it was "shocked and deeply concerned by the recent incidents of xenophobic abuse directed at the Polish community and other UK residents of migrant heritage".
Shuja Shafi, secretary general of the Muslim Council of Britain (MCB), said: "We need leadership now more than ever before. Our country is experiencing a political crisis which, I fear, threatens the social peace."
The MCB has compiled a dossier of reported Islamophobic incidents since the Brexit vote was announced on Friday.
The UK National Police Chiefs' Council reported an increase of 57 percent in reported incidents between Thursday and Sunday compared with the same days four weeks earlier -- 85, compared with 54 during the earlier period.
"It's no coincidence this has come off the back of the EU vote," a police source told media.