French President Francois Hollande is due to chair a crisis meeting with cabinet ministers on national security after last week’s deadly attacks, the BBC reports.
The meeting comes amid questions over how militants known to the authorities were able to launch the raids in Paris.
The assault on the offices of satirical magazine Charlie Hebdo and separate attacks on police officers and a kosher supermarket killed 17 people.
More than 1.5m people marched in the capital on Sunday in a show of unity.
The French government said the rally turnout was the highest on record.
About 40 world leaders joined the start of the Paris march, linking arms in an act of solidarity.
They included UK Prime Minister David Cameron, German Chancellor Angela Merkel, Israeli Prime Minister Benjamin Netanyahu and Palestinian President Mahmoud Abbas.
