Bibaa Henry and Nicole Smallman were found dead in a park (Image: PA)
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A "piercing scream" was heard on the night two sisters were stabbed to death in a park, a court has heard.
Nicole Smallman, 27, and Bibaa Henry, 46, were allegedly attacked by 19-year-old Danyal Hussein in the early hours of June 6 last year.
The sisters had been in Fryent Country Park in Wembley, north-west London, to celebrate Ms Henry's birthday.
Their bodies were discovered in bushes by Ms Smallman's boyfriend, who had joined the search for the missing women on June 7 last year.
On Tuesday, local resident Elaine Williams told the Old Bailey how she had been watching Silent Witness on television when she heard a noise at 1.45am on June 6.
She said she heard a man shouting and then more than one female shouting "really loud".
"All of a sudden I heard one female voice.
Danyal Hussein in custody at Wandsworth police station following his arrest
"And after I heard this really piercing scream that will live with me forever. It was so intense."
She told jurors that it was "like a massive argument".
Riel Karmy-Jones QC, defending, asked if it sounded like the voices knew each other.
Ms Williams replied: "No."
The next witness, Linda Guerrero, told how she saw two people in bushes as she walked her beagle Bambi on the morning of June 7 last year, before the bodies were discovered.
A knife similar to the one Danyal Hussein allegedly bought in Asda in Colindale
She said: "I crouched, peered in and I could see there was indeed somebody a bit further along on the ground.
"As I peered in I looked to see what I thought was a couple. The reason I thought it was a couple, the person lying on the floor with their back to me, it looked like they had a bare back.
"I also saw a pair of shoes that seemed to be draped over the person with the bare back. They seemed to be lying down.
"I assumed they were a couple because I thought they seemed to be intertwined slightly.
"I said something along the lines: 'Are you OK, are you alright mate?' There was no response."
She added: "We do occasionally get rough sleepers in the park and that's what I had assumed that the couple were – they had spent the night there sleeping."
The witness said that she later reported rough sleepers to StreetLink.
Martin Ridgway, a member of Barn Hill Conservation Group, visited the park on the morning of June 6 with some rubbish bags.
Mr Ridgway told jurors he found a "huge pile of items" on his litter-picking round.
It included three cushions, two backpacks, a large blue hold-all, a white paper bag, food packaging and sauce pots, the court heard.
He said he assumed red marks were from sauce pots as he collected up the bags and carried them to park bins.
CCTV of Bibaa Henry and Nicole Smallman entering Fryent Country
Pc Fifi Gaskin was on route to join the search for two missing people when she heard by police radio that two dead bodies had been found on June 7.
She was flagged down in the park by a man who directed her towards where he had heard screams, she said.
She said: "When I got to the top of the hill there was a male and he seemed very distressed. He was very pale. It looked like he was in shock."
On Monday, Ms Smallman's boyfriend Adam Stone told jurors how he screamed and fell to his knees when he found the sisters in bushes.
It followed the discovery of two pairs of sunglasses and a knife in the grass near to where the birthday celebrations had taken place, jurors had heard.
Hussein has denied double murder and possessing a knife
Last week the court heard that a combination of forensic evidence and CCTV footage led police to Hussein.
His DNA was at the scene, on the bodies of the victims and on a bloodstained knife found nearby, it was alleged.
In addition, Hussein had allegedly bought a set of knives in Asda and attended hospital the day after the killings with cuts to his hand from a knife.
Hussein, of Guy Barnett Grove, Blackheath, south-east London, has denied double murder and possessing a knife.