Video report by ITV News Correspondent Emma Murphy
Communities Secretary Sajid Javid has condemned those behind a series of Islamophobic letters that have reportedly been delivered to addresses across the country.
The letters, headlined "Punish a Muslim Day", appear to incite violence against Muslims and are being investigated by counter-terrorism police.
In a tweet, Mr Javid called reports of the letters "disturbing" and said "we will do everything in our power to tackle those who spread hate".
MP Yvette Cooper called the letters "vile", and her fellow MP Jess Phillips called on any of he constituents who received the letters to report them.
The letters, printed on A4 paper, encourage people to verbally and physically abuse Muslims, with points given for each action.
Anti-Muslim hate monitoring service Tell MAMA UK, which campaigns against anti-Muslim hate crime and Islamophobia say they had received reports going into "double figures" of people who have received the letters.
They confirmed they had received one from Leicester and one from the West Midlands.
Social media users in London and Birmingham also reported receiving the letters.
Several police forces confirmed they had received reports of the letters and said a full investigation was under way.
West Yorkshire Police said they had seen six of the letters and had sent a couple for analysis to determine their possible origin.
Iman Atta, director of Tell MAMA, said the letters were "disturbing".
She told ITV News: "If you receive such a letter through your letter box, that's a private letterbox that you have, that means that it's targeted towards you so that has actually heightened the sense of fear within Muslim communities."