A French former jihadist in Syria has been arrested over the fatal shooting of three people at the Jewish Museum in Brussels on May 24.

The arrest, announced by French and Belgian prosecutors during simultaneous news conferences in Paris and Brussels on June 1, confirms the worst fears about the security threat posed by battle-hardened European jihadists returning from the fighting in Syria.

Western security officials estimate that up to 2,000 Europeans—including 800 from France and 200 from Belgium—have traveled to Syria in the hopes of overthrowing the regime of Syrian President Bashar al-Assad and replacing it with an Islamic state.

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