Saudi Arabia has arrested 10 more suspects in what it says is a spy ring linked to Iran, state media report.
Those detained include eight Saudis, a Turk, and a Lebanese citizen. Eighteen people were arrested in the same case in March.
Saudi Arabia, which is predominantly Sunni Muslim, has recently repeatedly found itself at odds with Iran, an overwhelmingly Shia Muslim nation.
Iran has denied any involvement in spying in Saudi Arabia.
Those arrested in March included an Iranian, a Lebanese and 16 Saudis. The Lebanese suspect has subsequently been released, officials said.