On 4 June Ukraine’s security service said that a French citizen detained in late May on the border with Poland had been planning attacks in France to coincide with the Euro 2016 football championship. The unnamed 25-year-old had been arrested with an arsenal of weapons and explosives including rocket launchers and Kalashnikov assault rifles in his vehicle. Authorities said the man had made contact with armed groups in Ukraine with the aim of buying weapons and explosives. A Paris police raid on his home uncovered ingredients for homemade explosives. The United States warned its citizens of the possibility of further attacks in Europe, saying targets could include Euro 2016 (which opens in France today). Gun attacks, remotely detonated bombs, and even drones carrying explosives and chemical weapons are just a few of the terrorist threats French authorities are preparing for. See also: