Police shot a man dead at a home in Milton Keynes after finding another man dead and a young child seriously injured.
The incident happened after officers forced their way into a property in Denmead, Two Mile Ash, at about 9.40am on Saturday after a witness sounded the alarm.
Inside they found a man in his 30s who was later confirmed dead, as well as the child who had serious injuries.
Officers came across another man in his 20s inside the property and it is understood they first deployed a Taser at him, before firing gun shots.
First aid was immediately given to him and ambulance crews treated him but he was pronounced dead at the scene, Thames Valley Police said.
Thames Valley Police has launched an investigation into the incident, making a mandatory referral to to the Independent Office for Police Conduct (IOPC).
The young child was rushed to hospital with serious injuries where they remain.
Police said the dead men’s next of kin had been notified, and that officers were likely to remain on watch outside the property for several days.
The force said its investigation was ‘at a very early stage and no further information can be provided at this time’.
‘Our thoughts are with all those affected by this tragic incident,’ the IOPC statement added.
Assistant chief constable Christian Bunt, said: ‘What has happened this morning can only be described as absolutely tragic and will no doubt have an impact on the community.
‘Our thoughts are with those who have been impacted by this incident.
‘Our major crime unit are working closely with the IOPC to understand exactly what has happened.
‘At this stage no one else is being sought in relation to this investigation and we are seeking to support everyone involved.
‘Members of the community will see an increased police presence. We would ask anyone who has any concerns or information to please speak to one of our uniformed officers.’