The company said it does not intend to reveal the identities, nationalities and number of BP employees at In Amenas site due to the uncertain situation.

Following an attack at the gas facility many workers were held captive by armed militants.

The gas facility located about 1,300km from Algiers and around 60km west of the Libyan border, is operated by Algerian state oil company, Sonatrach, along with BP and Norway’s Statoil.

Soon after the crisis was reported, BP mobilized its full emergency response system and has been working with teams in Algeria, UK and other parties.

The company is also in close contact with the UK government and with Sonatrach and Statoil regarding the situation.

BP Group chief executive Bob Dudley said, "Supporting our colleagues and their families at a time of such extreme concern is essential, and we are seeking to support them in every way we can."

As a precautionary measure, the company has started bringing back its non-essential workers out of Algeria.