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A one-year-old boy is in a critical condition after he and his mother were stabbed in a knife attack in Feltham, West London.

One neighbour heard children shouting "don't kill my mum" as the horrific double stabbing unfolded.

Neighbours were told by police to lock their doors as officers scoured the streets for the attacker, who police say lived at the home where the attack took place.

An air ambulance landed at a school close to the scene, and witnesses said armed officers descended on the estate.

The baby boy is said to be critical in hospital while his mum, in her 30s, is not believed to be in a life-threatening condition.

Police said enquiries are underway to trace a man who was known to live at the address.

A large blood smear could be seen on the white wall at the entrance of a terrace house in Swinfield Close.

Witnesses heard screaming and crying - adding that the terrifying incident is especially shocking for mothers.

The sight of a baby boy stabbed left a police officer in tears, a neighbour told.

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(Image: Get West London WS) (Image: London News Pictures Ltd)

(Image: London News Pictures Ltd)

The neighbour said he heard shouting "all day" before the attack.

The 35-year-old said they saw a paramedic cradling the baby, adding: "The police officers were getting distressed - one was crying as well because of what he had seen and his colleagues were consoling him.

"I was shocked to see it myself."

Another neighbour, who did not wish to be named, told the Daily Mirror: “I was at home with my granddaughter and all of a sudden I’m hearing helicopters and police. I’ve lived here 30 years and never heard anything like it.

“I saw the woman coming down on a hospital trolley, she looked out of it. She was covered in blood.

“Then the air ambulance landed.

“Another two young children were shouting 'don’t kill my mum, don’t kill my mum' when it happened.

“What kind of a man does that to a baby or a woman, especially a baby. Hopefully they catch him soon."

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A neighbour told GetWestLondon: “I live right where it happened. We have been told by police to stay in and lock doors as a man is still on the loose.

“The estate is taped off, and there is an armed response present.”

One witness told Sky News: "I heard a lot of screaming and crying, it was quite distressing to hear."

Neighbour Gary Fletcher, 63, said two boys aged around six and next door neighbours of the victims witnessed their injuries.

He said: "They ran out screaming.

"One was pointing to his stomach so I presume he saw the stabbing."

(Image: London News Pictures Ltd)

A mum-of-three, 38, who lives nearby and wished not to be named said: "We didn't sleep last night.

"It's especially shocking for mothers. It is cruel."

Myrtle Cantwell, 62, who has lived on the estate for 38 years, said: "The air ambulance was hovering and there was lots of police.

"The police came by and banged on the door where it happened. The lady next door came out and ushered them in.

"I could see the police vans and the sirens but I stayed indoors."

(Image: Get West London WS)

A Met Police statement said: "Officers were called to a residential address at Swinfield Close, Hanworth at 19.12pm on Monday, 4 June to reports of concerns for the welfare of the occupants.

"London Ambulance Service and London’s Air Ambulance attended.

"At the scene a woman, aged in her 30s, and a one-year-old boy were found suffering stab injuries.

"Both victims were taken to a west London hospital for treatment.

"The boy remains in a critical condition. The woman's injures are not life threatening.

"Enquiries are underway to trace a man who was known to reside at the address."

(Image: Get West London WS)

A spokesman continued: “Work continues to establish to circumstances of the incident but at this early stage it is believed the parties involved were known to each other.

"A crime scene has been established and officers remain at the scene."

An ambulance service statement said: “We were called to reports of an incident in Hanworth. We sent an air ambulance and a number of other vehicles.

“We treated two people and took them to a major trauma centre as a priority.”

There have been no arrests and enquiries continue. Officers from Hounslow CID are investigating.

Anyone with information is asked to contact Hounslow Police on 101 or tweet @MetCC quoting CAD 6981/4June.

Alternatively, call Crimestoppers on 0800 555 111.