ALGIERS, Jan 19 (Reuters) - Algeria's national oil and gas company Sonatrach has estimated $11 million of losses a day from the shutdown of the In Amenas plant taken over by al Qaeda-linked fighters three days ago, a source inside the company said on Saturday.

The Algerian army staged a final assault on the gunmen on Saturday, a local source and the state news agency said.

The Sonatrach source, who asked not to be named, said the date for the plant to resume operations was not known.

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Keywords: SAHARA CRISIS/SONATRACH