Updated

The Norwegian energy company Statoil says a fourth Norwegian employee missing after a terror attack on a natural gas plant in Algeria has been confirmed dead.

Statoil CEO Helge Lund says the deceased was 43-year-old Alf Vik.

Lund said Saturday that one Statoil employee remains missing from the Jan. 16 attack on the Ain Amenas plant in the Sahara, which ignited a four-day siege by Algerian forces in which at least 37 hostages and 29 militants died. An Al Qaeda-affiliated group has claimed responsibility for the attack.

On Friday, Statoil confirmed the death of three of its Norwegian employees.

It was unclear whether the four were among the missing or whether their bodies had only now been identified. Norway has a forensic team in Algeria helping local officials.