Kuwait Times carries this story. Why Al-Saab was arrested is unknown. My guess is that the petition he presented the King severely embarrassed someone in the Ministry of Interior…

Saudi Shiite held after meeting king

RIYADH: Saudi authorities have detained a leading Ismaili activist after he complained to the king over alleged rights abuses against the Shiite minority, a fellow activist said yesterday. Security police detained Ahmed Turki Al-Saab in Riyadh on Tuesday, days after he and five other Ismaili Shiites from the southern province of Najran handed to King Abdullah a 300-page report over alleged abuses by its governor, seeking to have him removed, said Mohammed Al-Askar. “They (security services) did not say why he was arrested without being charged,” he told Reuters.

Saab played a key role in issuing the report, Askar said. Najran, bordering Yemen, is a centre of the Ismailis, a Shiite sect which has long complained of victimisation by the prevailing school of Sunni Islam followed by the Saudi state. It was the scene of violent clashes in 2000, when hundreds of Ismailis clashed with police over plans to dilute their presence with Sunnis.

The Ismailis have said they had successfully petitioned King Abdullah two years ago to halt settlement of up to 10,000 Yemeni tribesmen outside Najran city. The Ismailis sent a protest letter in January to Najran governor Prince Mishaal bin Saud, complaining of marginalisation and demanding an end to plans to settle another Yemeni tribe. The report that was presented to the king, which was signed by 77 Najran citizens, carried the same grievances.
…