France has deployed 5000 police to protect Jewish schools, following last week's attacks in Paris.
French President Francois Hollande is chairing crisis meetings with cabinet ministers over the incidents which left 17 people dead.
Prime Minister Manuel Valls has already admitted there had been 'clear failings' with the three gunmen involved in attacks at a satirical magazine and a kosher supermarket all previously known to authorities.
It follows mass unity rallies in Paris and across France on Sunday.
Our reporter Natalie Powell in Paris says the demonstrations were France's biggest ever.
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Authorities are still hunting Hayat Boumeddiene - partner of Amedy Coulibaly who attacked the kosher supermarket.
Our reporter Natalie Powell in Paris says there is a lack of clarity about her recent movements.
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Our reporter Natalie Powell in Paris says officials are under pressure about the incidents.
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OUT: ...a threat."
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