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Police have released a heart-breaking 999 call in which a four-year-old boy told an emergency services worker he couldn't wake his mother up because he feared she was dead.

The distressing recording was released after medics were able to save the woman's life thanks to the young boy's quick thinking.

After his mother collapsed the child managed to unlock his mother’s phone by pressing her thumb on its fingerprint lock.

He then used the phone’s ‘Siri’ function, saying ‘help’, which then connected the youngster to the emergency services.

After the call handler asked him where his mother was, the boy, named Roman, said he thought she was dead because "she's closing her eyes and she's not breathing".

The boy was able to give the call handler the correct address which saved police vital minutes in being able to send officers to the house straight away.

Thirteen minutes after receiving the call, officers arrived and managed to force entry to the Croydon home.

There they found Roman with his twin brother and younger brother all inside with their mum, who was lying unconscious on the floor.

Paramedics were able to give first aid to the woman and she was taken to hospital after regaining consciousness at the home.

Police have not revealed why the woman fell unconscious.

Chief Superintendent Ade Adelekan, from the Met's Command and Control Unit, where 999 calls are handled, said: "Hearing this call brings home the importance of teaching your young child their home address and how to call police or emergency services in an emergency situation.

"If you do nothing else today, then I'd implore any parents of young children to sit down with them and make sure they know what to do in this kind of situation and that they know how to contact police or other emergency services in an emergency.

“As this case demonstrates so poignantly, it could really be the difference between life and death.

"It's an amazing story and thanks to his quick thinking and by asking 'Siri' for help, this little boy saved his mum's life and it means she is still here and can be extremely proud of him and his brothers."