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Sick leaflets calling for Muslims to be 'butchered' in a day of hate have sparked a police probe after they were posted through doors across Britain.

The disgusting propaganda advertises 'Punish a Muslim Day' next month, encouraging torture, acid attacks, arson of mosques and assault.

The Metropolitan Police are among the forces investigating the leaflets, which have been reported in London, the Midlands and West Yorkshire.

Anti-racism groups have voiced their horror at the leaflets, which direct anyone with questions to the HM Courts & Tribunals Service, and urged anyone who receives one to pass it to police.

In a hate-filled diatribe, it encourages supporters not to be 'sheep' and says: "Sheep follow orders and are easily led, they are allowing the white majority nations of Europe and North America to become over-run by those who like nothing more than to do us harm and turn our democracies into Shaira led police states."

(Image: Getty Images)

It promises 'rewards' for people who carry out racist and violent actions, ranging from verbal abuse, pulling headscarfs from women's heads, acid attacks, electrocuting Muslims and butchering people.

According to the letter, pulling a Muslim women’s hijab is worth 25 points, an acid attack earns 50 points and burning or bombing a mosque will see the attacker collect 1,000 points.

There is also an image of a dagger with the letters MS, suggesting it is linked to so-called Muslim Slayer who targeted mosques in London and the United States last year with similar threats.

Activist group Tell MAMA, which was set up to tackle anti-Muslim hatred, said the threats were being treated with "the utmost seriousness".

In a statement the organisation said: "It is essential that all letters and envelopes are kept and handled minimally to preserve evidence for the police to investigate.

"Incidents like this are rare but we urge vigilance and calm as we remind Muslim communities that our confidential support service is available to assist in this matter."

(Image: AFP)

Councillor Riaz Ahmed, a Lib Dem in Bradford, West Yorks., said he received the letter to his business address.

He said: "It was not addressed to anyone, just the address and postcode as if it was sent out randomly. It has a second class stamp on the plain white envelope and the frank mark is Sheffield. It was posted yesterday.

"It seems strange that anyone would send something like this to an address in a predominantly Muslim area. When I opened it and saw the content I was horrified."

The Metropolitan Police has confirmed it is aware of the leaflets being distributed in the capital.

A spokesman said: "The MPS does not tolerate any form of hate crime. If anyone believes they have been a victim of such an offence we would encourage them to report it to police so it can be fully investigated."

A spokesman for West Yorkshire Police said: "Police are investigating a number of reports of potentially malicious communications sent to individuals in the Bradford area.

"Officers are currently investigating the full circumstances."

Anyone with any concerns about a communication they may have received should contact police on 101.