The attack on Bonga not only hit production but also raised questions about assumptions by industry and successive governments that deep-water facilities lay beyond the reach of militant activity.

A Shell spokesman confirmed that the Bonga FPSO was shut in last week by the vessel's master when he saw attackers approaching.

Production from the 225,000-barrels-per-day capacity unit was resumed on Tuesday this week with any damage from the incident said to have been minor.

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