BP, a joint operator of the In Amenas gas field in the east of the country, joined the UK Foreign & Commonwealth Office (FCO) in confirming that the incident is "ongoing".
Two people, French and British nationals, are reported to have been killed in a series of connected incidents which first saw a bus carrying Statoil workers to the local airport fired upon before the attackers turned on the wet gas production facility itself at around 05:00 GMT on Wednesday.
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