A drone is displayed Wednesday at Paris store Azur Modelisme. Law enforcement officials in the city are concerned about recent unexplained drone fly-bys of high-security sites, including the Eiffel Tower and the U.S. embassy. Eleanor Beardsley/NPR hide caption

itoggle caption Eleanor Beardsley/NPR

French comedian Dieudonne M'Bala M'Bala arrives for his trial at the courthouse in Paris on Jan. 28. He goes on trial again today on charges of "defending terrorism," following remarks he made on Facebook after the deadly attack on the satirical weekly Charlie Hebdo. Caroline Blumberg /EPA/Landov hide caption

itoggle caption Caroline Blumberg /EPA/Landov

Cherif Kouachi, one of the brothers responsible for the Charlie Hebdo attacks, spent 20 months in Fleury-Merogis prison just outside Paris, where he crossed paths with a radical imam with ties to Osama bin Laden.This photo shows the men's building in May 2014. Charles Platiau/Reuters/Landov hide caption

itoggle caption Charles Platiau/Reuters/Landov

A police photo showing Said Kouachi from an arrest some time before the Jan. 7 attack on the French magazine. Said, who was killed by police two days after the attack, was reportedly secretly buried in his hometown of Reims. Uncredited/AP hide caption

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French President Francois Hollande gestures as he delivers a speech to foreign ambassadors during a ceremony to extend New Year wishes at the Elysee Palace in Paris on Friday. Jacques Brinon/AP hide caption

itoggle caption Jacques Brinon/AP

Pope Francis disembarks from the plane upon his arrival at the airport in Manila, Philippines, on Wednesday. In comments to reporters aboard the plane, Francis said though the attack on Charlie Hebdo magazine was an "aberration," free speech "cannot make provocations," especially against people's faith. Ettore Ferrari/EPA/Landov hide caption

itoggle caption Ettore Ferrari/EPA/Landov

Belgian police block a street in central Verviers on Thursday. Two men were killed and a third arrested when police raided an apartment used by suspected Islamist radicals. Reuters /Landov hide caption

itoggle caption Reuters /Landov

Great Rabbi of France Haim Korsia, right, speaks as the Imam of the eastern suburb of Drancy, Hassen Chalghoumi, left, and others listen during a ceremony at the synagogue of Sarcelles, France, in July 2014, after pro-Palestinian protests in Paris and Sarcelles. Stephane de Sakutin/AFP/Getty Images hide caption

itoggle caption Stephane de Sakutin/AFP/Getty Images

French Ambassador to the U.S. Gerard Araud addresses a solidarity gathering at the Adas Israel Congregation in Washington, D.C., on Wednesday. Araud said last week's attack was "in a sense maybe worse than what we were expecting, because it was done in a very professional way." Nicholas Kamm/AFP/Getty Images hide caption

itoggle caption Nicholas Kamm/AFP/Getty Images

Dieudonne M'Bala M'Bala, the French comedian better known as Dieudonne, has been arrested and held on charges of apologizing for terrorism in the wake of a Facebook post that referred to last week's deadly attacks in Paris. Michel Euler/AP hide caption

itoggle caption Michel Euler/AP

French Prime Minister Manuel Valls delivers his speech during an homage to the 17 victims of last week terrorist attacks, at the French national Assembly in Paris on Tuesday. Remy de la Mauviniere/AP hide caption

itoggle caption Remy de la Mauviniere/AP