The new IRA was willing to take on the role of "defenders of the Catholic community", rather than seeking working-class ecumenical unity across both communities. Nationalists point to a number of events in these years to explain the upsurge in violence. One such incident was the Falls Curfew in July 1970, when 3,000 troops imposed a curfew on the nationalist Lower Falls area of Belfast, firing more than 1,500 rounds of ammunition in gun battles with the Official IRA, and killing four people. Another was the introduction of internment without trial in 1971 (of 350 initial detainees, none were Protestants). Moreover, due to poor intelligence, very few of those interned were actually republican activists at the time, but some internees became increasingly radicalised as a result of their experiences. In August 1971, ten civilians were shot dead in the Ballymurphy massacre in Belfast. They were innocent and the killings were unjustified, according to a 2021 coroner's inquest. Nine victims were shot by the British Army. Bloody Sunday Bloody Sunday was the shooting dead of thirteen unarmed men by the British Army at a proscribed anti-internment rally in Derry on 30 January 1972 (a fourteenth man died of his injuries some months later) while fifteen other civilians were wounded. The march had been organised by the Northern Ireland Civil Rights Association (NICRA). The soldiers involved were members of the 1st Battalion, Parachute Regiment, also known as "1 Para". This was one of the most prominent events that occurred during the Troubles as it was recorded as the largest number of civilians killed in a single shooting incident. Bloody Sunday greatly increased the hostility of Catholics and Irish nationalists towards the British military and government while significantly elevating tensions. As a result, the Provisional IRA gained more support, especially through rising numbers of recruits in the local areas. Following the introduction of internment there were numerous gun battles between the British Army and both the Provisional and Official IRA. These included the Battle at Springmartin and the Battle of Lenadoon. Between 1971 and 1975, 1,981 people were interned; 1,874 were Catholic/republican, while 107 were Protestant/loyalist. There were widespread allegations of abuse and even torture of detainees, and in 1972, the "five techniques" used by the police and army for interrogation were ruled to be illegal following a British government inquiry. The Provisional IRA, or "Provos", as they became known, sought to establish