Officials at the energy industry's biggest annual gathering believe investment in some new projects may slow, particularly in North Africa, following last week's siege at an Algerian gas plant and a 2012 cyber attack on Saudi oil computers, Reuters reported.

"Our industry is traditionally linked to political risks but last week's events will lead to a major review of security spending," Andrei Kuzayev, who heads overseas operations at Russia's Lukoil, told the news wire.

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