The man suspected of masterminding a co-ordinated group of deadly suicide bombings in Riyadh in May has surrendered to the authorities in Saudi Arabia, Saudi officials have said. Ali Abdul Rachman al-Gamdi, also known as Abu Bakr al-Azdi, was number two on the list of most-wanted suspects in connection with the attacks. A US official who asked not to be named told the BBC that the detention of Mr Gamdi was a major blow to al-Qaeda's operations in Saudi Arabia. Thirty-five people, including nine bombers, died in the 12 May attacks on compounds housing Americans and other westerners in Riyadh. The US and Saudi authorities blame the al-Qaeda network for the bombings.