The bloodshed at In Amenas has left the oil and gas industry
struggling to come to terms with what it might mean for investment in risky countries.
Bob Dudley, BP's chief executive says the company
is "reviewing security" at its other facilities in the region and around the world.
The attack is the worst tragedy of its kind in living memory despite the energy industry's presence in many unstable regions.
BP has "never experienced an attack on this scale before", Mr Dudley says.
Security remains a top priority in countries such as Iraq,
where there have been instances of workers being kidnapped.
The perception of risk for foreign oil workers and their families in North Africa, has soared.