Qatar 's Ras Laffan Liquefied Natural Gas Co., known as RasGas, said Thursday it has been attacked by a computer virus that has shut down part of its computer system since Aug. 27, but left its production unharmed.

Desktop computers were affected but operational systems both onsite and offshore are secure, the world's second-biggest LNG producer said in a statement.

The bug did "not affect production at the Ras Laffan Industrial City plant or scheduled cargoes," it said.

State-giant Saudi Arabian Oil Co., known as Saudi Aramco, was attacked earlier this month by a virus that originated from external sources. The attack forced the world's largest oil producer to isolate all its electronic systems from outside access, but didn't affect operations.

Aramco said Sunday it has restored all of its main internal network services and workstations have since been cleaned and restored and, as a precaution, remote Internet access to online resources was restricted.

It isn't clear whether RasGas' bug was the same virus that attacked Saudi Aramco.

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