Authorities promptly raise the terror threat level to "Critical" fearing another attack.[288][289][290] Twenty-two people were arrested in connection with the attack, all of whom had been released without charge by 11 June.[291] 22 129 Egypt May 26 A gunman opened fire on a convoy carrying Coptic Christians traveling from Maghagha in Egypt's Minya Governorate.[292] 28 22 France June 6 2017 Notre Dame attack A lone wolf who was carrying knives in his rucksack attacked an officer guarding Notre Dame de Paris with a hammer.