A man has been shot dead by police who had discovered the body of another man and a seriously injured child at a property.
Thames Valley Police officers were called to Denmead in Two Mile Ash, Milton Keynes, at 09:40 BST on Saturday over a “serious disturbance”.
They found a man in his 30s, who was later confirmed dead, and the child.
A man in his 20s was also at the property and a Taser was deployed before shots were fired, police said.
Police said first aid was given and ambulance crews treated the man they had shot, but he was later pronounced dead.
The Independent Office for Police Conduct (IOPC) said it had received a referral from Thames Valley Police and said its investigation was “at a very early stage and no further information can be provided at this time”.
Police have not revealed any more details about the child who was taken to hospital, such as an age or whether it was a boy or girl that was found.
The next of kin of both of the dead men have been notified, the force said.
Assistant Chief Constable Christian Bunt said: “What has happened 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.”
Police are not seeking anyone else in relation to the deaths and said officers were likely to remain outside the property for several days.
Anyone with information has been asked to contact the force.