49-year-old Garry Barlow was a married father of two from Liverpool. He worked as a system supervisor for BP at the In Amenas plant, and is believed to be among the dead. A statement issued on behalf of his family said:
Garry was a loving, devoted family man, he loved life and lived it to the full. He was very much loved by myself, his sons, mother and sister and the rest of his family and friends and will be greatly missed.
He was very proud of his family, as they were of him. We are totally devastated by the news of his death and would ask that the family be left in peace to grieve.
David Cameron warned that north Africa is becoming a "magnet for jihadists" as he announced help to tackle the terror threat in the region.
A British man from Aberdeenshire has spoken to ITV News about his dramatic escape from militants and his concern for some of his colleagues.
Stephen McFaul, one of dozens of hostages taken by Islamist fighters at gas plant in Algeria, is due to arrive back in Belfast later today.