E.U. authorities brace for wave of Islamic State fighters after Mosul assault

French President FranA ois Hollande, center, speaks with Slovakian Prime Minister Robert Fico, right, while flanked by Lithuanian President Dalia Grybauskaite during a European Union summit to discuss Syria, relations with Russia, trade and migration on Thursday in Brussels. A long-awaited offensive this week to dislodge the Islamic State from its stronghold city of Mosul is fueling fears of renewed terrorist attacks, as European counterterrorism officials say more fighters The security concerns are a major focus of European intelligence agencies as the Iraqi army and its partners press the assault on Mosul , which the Islamic State has used as a capital for planning and operations for more than two years.