The hostage crisis at a gas facility in the Algerian desert has yet to be resolved, officials have said.
The UK said the incident near In Amenas was "ongoing" and Algerian state media said Islamist militants were holding foreign workers at a treatment plant.
At least four hostages and a number of militants were killed on Thursday when troops stormed the living quarters.
The militants had claimed to be holding 41 foreigners. At least four were freed but the fate of many others is unknown.