The presence of ISIL has been felt most in North Africa. Militant groups are aligned to ISIL in Egypt's Sinai region. The Egyptian army has been battling them there. But the group's strongest presence was in Libya. ISIL seized the city of Sirte there. For months, forces loyal to Libyan general Khalifa Haftar battled ISIL, assisted by U.S. airstrikes. The city was eventually liberated only last year, but it's believed that thousands of ISIS fighters have gone to ground in the country, and are not only recruiting, but also planning attacks. Infighting between Libya's rival governments continues, too. Groups like ISIL have been taking advantage of the political chaos.