A French soldier patrols near the Eiffel Tower as part of the highest level of “Vigipirate” security plan after a shooting at the Paris offices of Charlie Hebdo January 12, 2015.

French Interior Minister Bernard Cazeneuve on Monday said 10,000 security forces will be mobilized throughout the country, with 5,000 policeman deployed to protect Jewish schools.

Cazeneuve said the deployment will begin Tuesday, and will focus on the most sensitive locations, the Associated Press reported.

Meanwhile, one of the three gunmen who killed 17 people in a series of attacks in Paris this week “undoubtedly” had an accomplice, French Prime Minister Manuel Valls said on Monday.

Amedy Coulibaly, one of the three gunmen, likely received help from someone else, Valls said, pledging, “the hunt [for the accomplice] will go on.”

Valls said the search for the accomplice is urgent because “the threat is still present” after the attacks that left 17 people dead – journalists at the satirical newspaper Charlie Hebdo, hostages at a kosher market and three police officers. All three attackers died Friday in nearly simultaneous raids by security forces.

The widow of one of the attackers, identified as Hayat Boumedienne, crossed into Syria on Thursday, the day after the Charlie Hebdo massacre, and the same day her husband shot a policewoman to death on the outskirts of Paris, according to Turkey’s foreign minister.

Mevlut Cavusoglu told the state-run Anadolu Agency on Monday that Hayat Boumedienne arrived in Turkey from Madrid on Jan. 2, ahead of the attacks and stayed at a hotel in Istanbul before crossing into Syria on Thursday.

Video emerged on Sunday of her husband Amedy Coulibaly, explaining how the attacks would unfold and police want to find the person who shot and posted the video, which was edited after the attacks were over.

Valls told BFM television on Monday that France is at war against “terrorism, against jihadism, against radical Islam.”

Survivors say the Charlie Hebdo attackers, brothers from Paris, claimed they were from al-Qaida in Yemen, the group the U.S. considers the most dangerous offshoot of that network. In the video, Coulibaly pledges allegiance to the Islamic State group.

But ties among the men date back to at least 2005.

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