Italian Carabinieri patrol outside Rome's Synagogue, Monday, Jan. 12, 2015. The killing of four French Jews in last week's hostage standoff at a Paris kosher market has deepened the fears among European Jewish communities shaken by rising anti-Semitism and feeling vulnerable due to poor security and a large number of potential soft targets. A spokesman for the Jewish community in Rome, one of the oldest Jewish communities in the world, noted that security has long been tight. Metal barricades and other cement planters keep passers-by and cars from getting close to the main synagogue, and Italian police officers with automatic weapons stand guard in sentry boxes day and night.

Police: As many as 6 Paris terror suspects may be at large

The French police officials spoke on condition of anonymity because they are not authorized to discuss details of the investigation with the…