Officers immediately provided first aid, including CPR, but despite their efforts and those of paramedics, the man was sadly pronounced dead at the scene at 21:30hrs.
The investigation is in its very early stages.
A non police firearm was located by officers at the scene. A further search of the address suggests nobody else was present at the time of the incident.
Commander Kyle Gordon, Frontline Policing Commander for North and East London, said: “My thoughts are with the loved ones of the man who has died, with the local community in Dagenham and the officers involved in this incident.
“While formal identification has yet to take place, officers believe he was aged 40. His next of kin has been informed.
“They will receive our full support.”
The Met’s Directorate of Professional Standards was made aware immediately after the incident and the Independent Office for Police Conduct has been informed.
A Spokesman for the IOPC said:
We have been notified by the Metropolitan Police Service that a man has been fatally shot, during an incident in Dagenham, east London, shortly before 9pm this evening. We have begun an independent investigation and our investigators have been sent to the scene and the police post-incident procedures to begin gathering information. We have no further information at this time.
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