The Ballymurphy massacre was a series of incidents between 9 and 11 August 1971, in which the 1st Battalion, Parachute Regiment of the British Army killed eleven civilians in Ballymurphy, Belfast, Northern Ireland, as part of Operation Demetrius. The shootings were later referred to as Belfast's Bloody Sunday, a reference to the killing of civilians by the same battalion in Derry a few months later, known as Bloody Sunday. The 1972 inquests had returned an open verdict on all of the killings, but a 2021 coroner's report found that all those killed had been innocent and that the killings were "without justification".