Many French media websites have gone down a day after warnings of a wave of Islamist cyber attacks.
The French government announced that nearly 20,000 sites had been targeted after terror attacks in Paris left 17 dead.
The sites among those affected were Le Parisien, Marianne and 20 Minutes.
The web host of the media sites said it was investigating if it involved someone in their company, but has ruled out an external distributed denial of service attack.
On Thursday the head of cyber security for the French military, Vice Admiral Arnaud Coustilliere, said structured groups and well known Islamist hackers were behind the attacks against the 20,000 sites, but did not elaborate any further.
One web host, Oxalide, said that no line of enquiry was being dismissed, however, its initial investigations had ruled out the possibility of an external distributed denial of service attack.
The company says it is still in the process of determining who is responsible for the attack, and says it will release a report on Friday.
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