On 26 June 2015, attacks occurred in France, Kuwait, Syria, Somalia, and Tunisia, one day following a deadly massacre in Syria. The day of attacks was dubbed "Bloody Friday" by Anglophone media and "Black Friday" (French: Vendredi Noir) among Francophone media in Europe and North Africa.One attack at a Tunisian beach resort killed 39; a bombing at a Shia mosque in Kuwait City killed 27 and injured several; while in Kobanî a large-scale massacre by ISIL resulted in more than 223 civilians murdered, in line with over 79 assailants (including 13 suicide bombers) and 23 Kurdish militiamen, dubbed the second-largest massacre by ISIL since summer 2014; a suicide bombing by ISIL in Al-Hasakeh, also in Syria, resulted in 20 fatalities; Al-Shabaab militants killed 70 African Union soldiers from Burundi in Leego, Somalia; finally, one man was decapitated, while several were injured during the Saint-Quentin-Fallavier attack in France.

Islamic State of Iraq and the Levant senior leader Abu Mohammad al-Adnani had released an audio message three days earlier encouraging militants everywhere to attack during the month of Ramadan. ISIL also claimed responsibility for the attacks in Tunisia, Syria and Kuwait.According to The Guardian, there is no evidence that the attacks were coordinated among the perpetrators, but their timing on a single day received significant coverage. One security analyst said the attacks added up to "an unprecedented day for terrorism." In total, more than 403 people died and 336 were injured, not including any attackers involved.