A four-year-old boy saved his mother's life by using her thumb to unlock her iPhone and then asking it to call 999.

Roman, who lives in Kenley, Croydon, south London, used the phone's voice control - Siri - to call emergency services.

Police and paramedics were sent to the home and were able to give live-saving first aid to his mother.

During the 999 call Roman told the operator he thought his mum was dead because "she's closing her eyes and she's not breathing".

Roman, his twin brother and a younger brother were all in the house at the time.

Met Police Ch Supt Ade Adelekan 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."