European Union flags set of half staff outside the European Commission headquarters in Brussels, Belgium, Friday, July 15, 2016, to pay tribute to victims of an attack at the France city Nice. A large truck mowed through revelers gathered for Bastille Day fireworks in Nice, France, killing more than 80 people and sending people fleeing into the sea as it bore down for more than a mile (2 Km) along the Riviera city's famed waterfront promenade. (AP Photo/Darko Vojinovic)