A teenager accused of brutally murdering two sisters in park allegedly signed a pact with the devil in his own blood because he thought it would help him win the lottery, a court was told.

Danyal Hussein, 19, from Blackheath, southeast London, is on trial for allegedly stabbing half-sisters Bibaa Henry, 46, and Nicole Smallman, 27, in Fryent Country Park, Wembley, northwest London, to death on June 6 last year.

The Old Bailey heard how police found a note pledging to "perform a minimum of six sacrifices every six months for as long as I am free and physically capable," and signed in blood at his mum's home in Eltham, southeast London on July 1.

It also stated he was to "sacrifice only women" and was addressed to "the Mighty King Lucifuge Rofocale".

Met Police released images of the note.

Danyal Hussein
Danyal Hussein is now on trial for murder

PC Lyndsay Barnett, of Met Police, said she found the the note on a piece of green card underneath the TV in Hussein's bedroom, Sky News reports.

It added he was also meant to "build a temple for you" and "do everything that I have promised."

In return, the note reads, he would "Win the Mega Millions super jackpot."

"To receive fruitful rewards in return for the future sacrifices I make to you, the rewards could consist of wealth and power, to never be suspected of any crimes by the police and also that the police will never know of any crimes that I have done and I will do," it said.

A note allegedly left by Danyal Hussein
Officers found a note allegedly detailing his murderous plot under a TV in Danyal Hussein's bedroom

At the bottom of the 'contract', Hussein allegedly signed "Danyal" in blood.

Three lottery tickets were found next to the note.

Oliver Glasgow QC, prosecuting, told the court PC Barnett took a photo of the pact with her mobile and sent it to colleagues "so they were aware straight away".

Danyal Hussein's alleged signature in blood
The note was signed in blood, according to police

Officers also found a series of orange cards with symbols drawn in black pen around the note.

CCTV footage showed Hussein visited a hospital to treat a cut on his hand three weeks after the alleged double murder.

After his arrest, he told the police he was injured while he was being "robbed".

Three lottery tickets found in Danyal Hussein's bedroom
Three lottery tickets were found next to the note

Officers attended Hussein's dad's house Kingsbury, northwest London, close to the crime scene, first, before heading to his mum's home in Eltham.

"I immediately recognised the male who answered the door as Danyal Hussein," PC William Lucas told the court.

Officers immediately pointed their tasers at him and he was arrested.

"I told him he was under arrest on suspicion of murder because he had been linked to two murders in Fryent Park and gave the date of 6 June 2020," the officer told the Old Bailey.

A blood-soaked knife alleged found at Danyal Hussein's property
A blood-stained knife with the defendant's DNA on it was recovered from the park

"Yeah, that's near my grandma's address," Hussein replied.

While in custody, he told police he was "really confused, scared."

Hussein also told police: "I'm autistic, I have Asperger's."

He denies double murder and possessing a knife.

The trial continues.