Saudi Arabia says it has taken into custody a man on its most wanted list of suspected al-Qaeda members.
Saudi security forces believe they have militants on the run
The interior ministry said Adnan bin Abdullah al-Omari was repatriated from another country, which it did not name.
He was one of 36 men on a list of most wanted militants published in June. Others on the list have been captured, killed, or have handed themselves in.
More than 90 people have been killed in a two-year militant campaign aimed at Saudi government and Western targets.
The attacks have included kidnappings, suicide bombings, and an assault on the US consulate in Jeddah last December.
Saudi authorities have launched an aggressive campaign against militants, engaging in clashes in which dozens have died on both sides.
The Saudis have said they believe they have gained the upper hand over the militants, who want to eject Westerners and the pro-Western royal family from the birthplace of Islam.