Princess Anne "sustained minor injuries and concussion following an incident" at her home in Gatcombe Park, Buckingham Palace said.
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Princess Anne is receiving hospital treatment for a head injury, according to Buckingham Palace.
The king's sister, 73, "sustained minor injuries and concussion following an incident" at her home in Gatcombe Park in Gloucestershire, England, the palace said.
"Her Royal Highness remains in Southmead Hospital, Bristol, as a precautionary measure for observation and is expected to make a full and swift recovery," the statement added.
The spokesperson said King Charles, had been "closely informed" about the incident.
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