JEDDAH (Reuters) - Saudi Arabia is trying seven Saudis accused of creating an Al-Qaeda-linked "terror cell" and setting up a training camp on the mountains near the country's southern border with Yemen, al-Watan daily newspaper said on Sunday. The trial is taking place in a special criminal court in Riyadh and is open only to selected local media. After Al-Qaeda militants launched attacks on Saudi Arabia in 2003, the authorities arrested thousands on suspicion of links to militant groups. Critics say the 12,000-30,000 people that rights groups say were imprisoned included political activists.