The Cairo fire (Arabic: حريق القاهرة), also known as Black Saturday, was a series of riots that took place on 26 January 1952, marked by the burning and looting of some 750 buildings—retail shops, cafes, cinemas, hotels, restaurants, theatres, nightclubs, and the city's Opera House—in downtown Cairo. The direct trigger of the riots was the attack on an Egyptian government building in the city of Ismaïlia by British Army troops the day prior, which killed 50 Egyptian auxiliary policemen. The spontaneous anti-British protests that followed these deaths were quickly seized upon by organized elements in the crowd, who burned and ransacked large sectors of Cairo amidst the unexplained absence of security forces. The fire is thought by some to have signalled the end of the Kingdom of Egypt. The perpetrators of the Cairo Fire remain unknown to this day, and the truth about this important event in modern Egyptian history has yet to be established.The disorder that befell Cairo during the 1952 fire has been compared to the chaos that followed the anti-government protests of 25 January 2011, which saw demonstrations take place amidst massive arson and looting, an inexplicable withdrawal of the police, and organized prison-breaking.