France's interior minister is calling for "extreme vigilance" after three days of attacks by terrorists linked to Al Qaeda that scarred the nation and left 20 dead.

Bernard Cazeneuve said after an emergency security meeting Saturday that the government is deploying hundreds of troops in addition to thousands of police and other security forces. He said that "we are exposed to risks" and France is maintaining its terror alert system at the highest level in the Paris region.

President Francois Hollande convened the meeting to discuss how to thwart a new attack. Three attackers were killed after they attacked satirical newspaper Charlie Hebdo, a kosher supermarket and a printing house in recent days.

An accomplice, the common law wife of one attacker, remains at large.