Some of the terrorists were actually employees of the BP facility ...

fantastic, isn't it?   We need a new term for this kind of internal terrorism.  "Home grown" is simply not adequate in this case.

BP's Human Resources Director and the other recruiters within that department  will be sought after employees now .... having done such a good job picking the right terrorists.  If these terrorists were not recruited into BP's workforce by BP's HR and gained access to the facilities because of their partnership with the local Muslim government .... then this should  be a wake-up call to each and every Western oil and gas company operating in the Middle East and Africa.

Peter Allen and Nabila Ramdani writing at DailyMailUK:
....Some of the terrorists involved in the Algeria hostage crisis in which up to five Britons died had been working at the BP plant where the atrocity took place, it was claimed today.

They had been given short-term contracts by the oil and gas giant, allowing them to plan their attack with lethal precision.
Five of the Al Qaeda operatives were ‘taken alive’ by the Algerian army today, while some 32 were killed during four days of fierce fighting with special forces.

Now there are claims that some of the Islamist radicals had been hired over the past year at the vast facility in the Sahara desert, close to the town of In Amenas.
This raises the possibility that the 23 gas workers who died, as well as those who were wounded and escaped, might have known their attackers.
Witnesses have already described one of the terrorists speaking with a ‘perfect English accent’, and appearing to have a good knowledge of the compounds around the gas field......