Saudi Arabia has concluded that a Libyan plot to assassinate the kingdom's de facto ruler in late 2003 was cloaked to look like an al Qaeda-inspired domestic revolt and was broken up only days before it was to have been carried out, according to Saudi officials and documents that detail the investigation. This month, a religious judge in Riyadh is tentatively scheduled to put 13 suspects on trial who have been in Saudi custody since the plot was uncovered in November 2003, Saudi officials said. The defendants are eight Saudis and five Libyans, including four Libyan intelligence agents, according to Saudi investigative documents reviewed by The Washington Post. The Libyans were caught delivering more than $1 million in cash at a hotel in Mecca to Saudi dissidents hired to assassinate Crown Prince Abdullah, who has ruled the kingdom since 1996, after his half brother, King Fahd, was incapacitated by a stroke. The Libyan agents had recruited the Saudis to launch grenades and other explosives into Abdullah's apartment in Mecca, the documents show.The assassination was planned to occur about three weeks after al Qaeda suicide bombers blew up a residential compound on Nov. 9, 2003, in Riyadh, killing 17 and wounding 122. That attack marked the apex of a violent campaign unleashed six months earlier by al Qaeda cells to drive Westerners out of the kingdom and weaken the Saudi government. The plot was publicly disclosed last June, when an American Muslim leader from Virginia pleaded guilty in U.S. District Court to illegal dealings with Libya and told prosecutors about the planned assassination. The Saudi investigative documents show for the first time, however, that the operation was disguised as an al Qaeda operation and give fresh details about the Libyans and Saudis involved and what led to their arrests.