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This is the chilling scene in a suburban London street after eyewitnesses claim a silent killer sat beside an 18-year-old as he repeatedly stabbed him to death.

Young girls watched in horror as the knifeman chased the "humble and polite" teen as he ran for his life.

The teenager then collapsed on the street in Hayes, west London, and the killer then sat beside him.

The suspect then continued to stab him in the back, an eyewitness said, while a neighbour yelled for the killer to stop.

The woman, in her 50s, who has lived in the area for more than a decade, said: "I even tried to stop it. I was screaming and shouting at the boy to stop what he was doing.

(Image: SWNS)

"The victim was running away from him.

"He ran up Gledwood Gardens and he took a turn around the tree and came up the road. That's when I saw blood on his back.

"He was running for his life. When I saw the blood on his back I picked up my phone. I picked up the phone and I saw the boy on the ground and the other one sitting there next to him stabbing him more.

"I shouted, 'Oi, stop it' and called 999.

"He was sat on the floor. The other one had multiple stab wounds on him. The blade was slashing about like anything.

(Image: SWNS)

"He still carried on even though the white boy fell down.

"He was quiet. He was totally quiet. They were not saying anything.

"I didn't even think of my safety, whether he would come for me afterwards.

"I didn't sleep all night. I'm totally shocked.

"He walked off. He had the knife in his right hand and he just walked off. He didn't even run. He didn't walk very fast - it was like nothing had happened.

"He was just so calm."

(Image: SWNS)

The 18-year-old is the seventh teenager to be murdered in London this year.

Emergency services were called shortly before 4pm on Monday.

However despite efforts to resuscitate the man, he died at the scene.

Investigating officers said the argument started in a home on Gledwood Gardens and the pair were known to each other.

It is believed the semi-detached home where the trouble broke out is a half-way house for troubled teens.

The area of the incident remains under a police cordon today.

Gurdeep Chaggar, a father of two, ran out of his home to try and save the youngster's life after his 11 and 12 year old daughters told him what happened.

The 47-year-old dad said: "My daughters went out to get ice creams.

"They came back and ran up the stairs saying, 'There's a mixed race guy stabbing a white guy - seriously dad'.

"The young white guy was laying on his face. I saw the wounds on his back. They were about two inches wide and gaping about an inch. There were two to three wounds.

"The guy had had a proper go at him. When I saw him he was finished.

"I told my daughters to get towels.

"I put pressure on the wounds. I felt his pulse it was hardly there and within minutes it disappeared.

"He was dead before the paramedics arrived.

"I was still there when the paramedics arrived. When you are doing that it seems like forever but in reality it was about five minutes.

"He muttered something to me. It sounded like, something, something 'Bruv'.

"To be honest, I wasn't listening. I was too busy trying to save his life.

(Image: SWNS)

"I feel sad for him. I always said hello to him and he would reply, 'Alright bruv'."

He said his daughters suffered nightmares last night.

He added: "One said it was a big knife and looked a bit like a kitchen knife."

Arginder Marok, 33, lives next door to where the fight broke out with his parents, wife and his child.

He said the residents regularly blast out music in the early hours but said the boy who died was always friendly.

Mr Marok said: "He was a young kid. He was polite and really nice.

"He used to stand out her and say, 'How are you doing?' He was a calm man and he was humble.

"I've seen him here for about a month. He was always by himself. He didn't look thuggish like the others. He was a kind, quiet boy.

"He was the nicest one, in my opinion, and he was vulnerable."

Neighbour Jas Bassi, 41, said she heard the woman screaming for help as she watched the attack.

She said: "A woman was shouting and screaming about a guy with a knife.

"I had seen the boy [victim] around. He seemed perfectly nice and polite."

Police arrested an 18-year-old nearby on suspicion of murder.