The husband of Queen Elizabeth, Prince Philip, has been admitted to hospital Thursday due to abdominal problems.
The Duke of Edinburgh, 91, will undergo an exploratory operation for "abdominal investigations," a Buckingham Palace statement said.
He was taken to a London clinic after attending a garden party hosted by his wife.
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Prince Philip is expected to remain there for several weeks.
He missed an event on Monday evening, reportedly feeling under the weather.
He already spent a week in hospital last summer for a bladder infection.
Philip is the son of the exiled Prince Andrew of Greece and married Princess Elizabeth in 1947.