An attacker ploughed a truck through crowds celebrating Bastille Day on the French Riviera in the city of Nice on July 14, 2016, killing more than 80 people, including children, and injuring hundreds. The driver, identified by police sources as Mohamed Lahouaiej Bouhlel, a 31-year-old Tunisian resident in France, also had appeared to open fire before officers shot him dead. This was the third mass killing in Western Europe in eight months, causing much fear across an already anxious continent struggling with security challenges.