A white supremacist who called himself “Muslim Slayer” sent white powder and threatening letters to The Queen, Theresa May, and David Cameron during a two-year race hate campaign, the Old Bailey heard today.

David Parnham, 36, was behind the ‘Punish a Muslim Day’ series of letters which offered financial rewards for violent attacks, and sent packages of white powder to high profile figures as well as a string of mosques, the Home Office, and the Bank of England.

In his letters to the Queen and former Prime Minister Theresa May, Parnham wrote ‘The clowns R coming 4 you’, while the powder – later proving to be harmless – sent to David Cameron sparked a full-scale terror alert at Parliament, the court heard today.

Parnham, who admitted the idea of murdering ethnic minorities “turns me on”, followed the 2017 terror attack at Finsbury Park mosque with a series of threatening letters, echoing Enoch Powell’s infamous speech in one when he wrote: “There will be rivers of blood flowing down the street, I will make sure of this.”

He targeted Asian members of Parliament and mosques with the poison pen campaign, and also wrote to US white supremacist killer Dylann Roof to tell him he had “opened my eyes” with his murder spree, saying of Muslims: “I hate these animals with a passion”.

Prosecutor Diana Wilson said Parnham, who has no previous convictions, was responsible for a “sustained campaign of hate” that had caused fear in Muslim communities around the country.

In some of his letters, Parnham offered to donate £100 to charity if a Muslim was attacked, and in the ‘Punish a Muslim Day’ campaign he urged the assassination of leading Islamic figures.

Parnham admitted dispatched the series of letters from his home in Lincoln between 2016 and 2018, after being traced through his DNA, and is now due to be sentenced after undergoing a series of psychiatric assessments.

Among the titles of the hate letters were “The Great Cleanse” and “Bang! You’re dead”, while the “Jigsaw” series included a picture of a person being decapitated with a sword with a Swastika insignia, including the phrase “blood will be spilled”.

He has pleaded guilty to soliciting to murder, five charges of hoaxes involving sending noxious substances, seven charges of sending letters with intent to cause distress or anxiety, one count of making a bomb hoax, and one count of encouraging offences believing one of more would be committed.

Judge Anthony Leonard QC is expected to sentence Parnham tomorrow.