French customs officers check vehicles at the border crossing between France and Belgium in Neuville-en-Ferrain, northern France, as part of the hunt for fugitives wanted in connection with Friday’s attacks, Tuesday, Nov. 17, 2015. France invoked a never-before-used European Union “ mutual-defense clause” to demand Tuesday that its partners provide support for its operations against the Islamic State group in Syria and Iraq and other security missions in the wake of the Paris attacks. (AP Photo/Michel Spingler)