Saudi Arabia's foreign minister says King Fahd is in stable condition, a day after being hospitalized for medical tests.

Prince Saud al-Faisal told reporters in Riyadh Saturday that test results have been reassuring about the king's condition.

Neither the prince or the royal palace has said what is ailing the elderly monarch, but officials say he is suffering from a lung infection, possibly pneumonia.

Saudi Arabia is the world's largest oil exporter, and news of the king's hospitalization Friday pushed world oil prices close to $52 a barrel.

Since King Fahd suffered a stroke in 1995, his half brother, Crown Prince Abdullah, has taken on many of the daily duties of running the kingdom.

Some information for this report provided by AFP and Reuters.