Saudi Arabia's King Fahd is being treated in hospital amid conflicting reports about his condition.
The authorities say he is in good health after being admitted for tests in the capital, Riyadh, on Friday.
But some medical sources suggest the king is being treated for possible pneumonia following a bout of flu.
The BBC's Frank Gardner says there have been rumours about King Fahd's health before but the latest scare could be more serious.
In 1995 he suffered a stroke, and Crown Prince Abdullah has performed most of his functions since then.
Prince Abdullah is regarded as successor to the throne.
Opposition sources in London predict that if the king dies there may well be a power struggle against the ruling princes.
There is heavy security around Riyadh's King Faisal hospital. Saudi security sources said a number of princes from the ruling family have been arriving in the capital.
The royal palace has not given details of the king's symptoms.
On Saturday Reuters news agency quoted officials as saying he was stable following treatment to drain water from his lungs.
The authorities say he is in good health after being admitted for tests in the capital, Riyadh, on Friday.
But some medical sources suggest the king is being treated for possible pneumonia following a bout of flu.
The BBC's Frank Gardner says there have been rumours about King Fahd's health before but the latest scare could be more serious.
In 1995 he suffered a stroke, and Crown Prince Abdullah has performed most of his functions since then.
Prince Abdullah is regarded as successor to the throne.
Opposition sources in London predict that if the king dies there may well be a power struggle against the ruling princes.
There is heavy security around Riyadh's King Faisal hospital. Saudi security sources said a number of princes from the ruling family have been arriving in the capital.
The royal palace has not given details of the king's symptoms.
On Saturday Reuters news agency quoted officials as saying he was stable following treatment to drain water from his lungs.
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