Question: Ivan Cooper led an anti-internment march which developed into a massacre where how many people died ?

full_context: Document 1: Bloody Sunday (1972): Bloody Sunday – sometimes called the Bogside Massacre – was an incident on 30 January 1972 in the Bogside area of Derry, Northern Ireland, when British soldiers shot 28 unarmed civilians during a peaceful protest march against internment. Fourteen people died: thirteen were killed outright, while the death of another man four months later was attributed to his injuries. Many of the victims were shot while fleeing from the soldiers and some were shot while trying to help the wounded. Other protesters were injured by rubber bullets or batons, and two were run down by army vehicles. 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".
Document 2: Paddy Wilson and Irene Andrews killings: The killings of Paddy Wilson and Irene Andrews took place in Belfast, Northern Ireland on the night of 25/26 June 1973. The victims, Roman Catholic Senator Paddy Wilson and his Protestant friend, Irene Andrews, were hacked and repeatedly stabbed to death by members of the "Ulster Freedom Fighters" (UFF). This was a cover name for the Ulster Defence Association (UDA), a then-legal Ulster loyalist paramilitary organisation. John White, the UFF's commander, who used the pseudonym "Captain Black", was convicted of the sectarian double murder in 1978 and sentenced to life imprisonment. White, however maintained that the UFF's second-in-command Davy Payne helped him lead the assassination squad and played a major part in the attack. Although questioned by the Royal Ulster Constabulary (RUC) after the killings, Payne admitted nothing and was never charged.
Document 3: New Lodge Six shooting: In the late hours of 3 February and the early hours of 4 February 1973, six men, all of whom were Catholics, were shot and killed in the New Lodge area of north Belfast, four (one IRA member and three civilians) of them were shot dead at the junction at Edlingham Street by British Army snipers, the other two men were shot dead by the Ulster Defence Association (UDA). Irish Nationalists and Republicans believe that collusion took place between the British security forces and Loyalist paramilitaries in the shootings. The six men who were killed became known as "The New Lodge Six".
Document 4: Don Mullan: Don Mullan (born 1956, Derry, Northern Ireland) is an Irish best-selling author/humanitarian and media producer. His book "Eyewitness Bloody Sunday" is officially recognised as a primary catalyst for a new Bloody Sunday Inquiry which became the longest-running and most expensive in British Legal History. Mullan, who is dyslexic, has spoken widely and was co-producer of a highly acclaimed and multi-award winning film about Bloody Sunday that was inspired by his book.
Document 5: Corporals killings: British Army corporals David Howes and Derek Wood were killed by the Provisional IRA on 19 March 1988 in Belfast, Northern Ireland, in an event which became known as the corporals killings. The off-duty soldiers were wearing plain-clothes when they were killed by the IRA after encountering the funeral procession of an IRA member whilst returning from Belfast to Lisburn. Three days before, loyalist paramilitary Michael Stone had attacked an IRA funeral and killed three people. Believing the soldiers were loyalists intent on repeating Stone's attack, dozens of people surrounded and attacked their car. During this, Corporal Wood drew his service pistol and fired a shot in the air. The soldiers were then dragged from the car, beaten, and taken to nearby waste ground where they were stripped and shot dead.
Document 6: Bloody Sunday Inquiry: The Bloody Sunday Inquiry, also known as the Saville Inquiry or the Saville Report after its chairman, Lord Saville of Newdigate, was established in 1998 by British Prime Minister Tony Blair after campaigns for a second inquiry by families of those killed and injured in Derry on Bloody Sunday during the peak of ethno-political violence known as The Troubles. It was published on 15 June 2010. The inquiry was set up to establish a definitive version of the events of Sunday 30 January 1972, superseding the tribunal set up under Lord Widgery that had reported on 19 April 1972, 11 weeks after the events, and to resolve the accusations of a whitewash that had surrounded it.
Document 7: Bloody Sunday (film): Bloody Sunday is a 2002 film about the 1972 "Bloody Sunday" shootings in Derry, Northern Ireland. Although produced by Granada Television as a TV film, it premiered at the Sundance Film Festival on 16 January, a few days before its screening on ITV on 20 January, and then in selected London cinemas from 25 January. The production was written and directed by Paul Greengrass. Though set in Derry, the film was actually shot in Ballymun in North Dublin. However, some location scenes were shot in Derry, in Guildhall Square and in Creggan on the actual route of the march in 1972.
Document 8: Ivan Cooper: Ivan Averill Cooper (born January 1944) is a former politician from Northern Ireland who was a member of the Parliament of Northern Ireland, and a founding member of the SDLP. He is best known for leading an anti-internment march which developed into the Bloody Sunday massacre on 30 January 1972, in Derry, Northern Ireland.
Document 9: 1997 Coalisland attack: On the evening of 26 March 1997, the Provisional IRA East Tyrone Brigade launched an improvised grenade attack on the fortified Royal Ulster Constabulary/British Army base in Coalisland, County Tyrone, Northern Ireland. The blast sparked an immediate reaction by an undercover Special Air Service unit, who shot and wounded Gareth Doris, an Irish republican and alleged IRA volunteer. The SAS unit was then surrounded by a crowd of protesters who prevented them approaching Doris or leaving. RUC officers arrived and fired plastic bullets at the crowd, allowing the special forces to leave the area.
Document 10: The Troubles in Limavady: Four people were killed in violence relating to the Northern Ireland Troubles in the town of Limavady, County Londonderry. All were Protestants, and all were killed by the Provisional Irish Republican Army (PIRA, better known as the IRA). One was a prison officer and one was a Royal Ulster Constabulary (RUC) officer. The other two victims were civilians killed by a van bomb explosion outside the Limavady RUC base on 28 March 1972. They were driving past at the time of the attack.
Document 11: Ivan Foster: Ivan Foster (born 1943) is a retired senior minister in the Free Presbyterian Church of Ulster and a former Democratic Unionist Party politician. He is a lifelong friend and associate of the Democratic Unionist politician and Free Presbyterian Church leader Ian Paisley. But in November 2006, he became the most prominent Free Presbyterian to openly challenge Ian Paisley's decision to enter into a power-sharing government with Sinn Féin and went on to denounce Ian Paisley from the pulpit of his church in January 2007.
Document 12: Ian Paisley: Ian Richard Kyle Paisley, Baron Bannside, PC (6 April 1926 – 12 September 2014) was a loyalist politician and Protestant religious leader from Northern Ireland.
Document 13: Bloody Sunday (1921): Bloody Sunday or Belfast's Bloody Sunday was a day of violence in Belfast, Ireland (present-day Northern Ireland) on 10 July 1921, during the Irish War of Independence. In retaliation for an Irish Republican Army (IRA) ambush of a police raiding party, Protestant loyalists attacked Catholic enclaves, burning homes and businesses. This sparked gun battles between republican and loyalist paramilitaries, and street fighting between Catholics and Protestants. There was also shooting between republicans and police, and it is claimed that some police patrols fired indiscriminately at Catholic civilians. Seventeen people were killed on 10 July, and a further eleven were killed or fatally wounded over the following week. At least 100 people were injured. About 200 houses were badly damaged or destroyed, leaving 1,000 people homeless. The violence took place just before a truce came into effect, which ended the war in most of Ireland.
Document 14: Northern Ireland civil rights movement: The Northern Ireland civil rights movement dates to the early 1960s, when a number of initiatives emerged which challenged inequality and discrimination in Northern Ireland. The Campaign for Social Justice (CSJ) was founded by Conn McCluskey and his wife, Patricia. Conn was a doctor, and Patricia was a social worker who had worked in Glasgow for a period, and who had a background in housing activism. Both were involved in the Homeless Citizens League, an organisation founded after Catholic women occupied disused social housing. The HCL evolved into the CSJ, focusing on lobbying, research and publicising discrimination. The campaign for Derry University was another mid-1960s campaign.
Document 15: The Troubles in Magherafelt: A total of eleven people were killed in violence relating to the Northern Irish Troubles in the town of Magherafelt, County Londonderry. Nine were killed by the Irish Republican Army (IRA), including three IRA members killed by the premature explosion of their own bomb while travelling through Magherafelt. One was killed by a non-specific republican group and another by the opposing Ulster Freedom Fighters (UFF). Of the others killed by the IRA, four were Protestant civilians. Three of them were killed in two separate car bomb explosions. The fourth Protestant civilian was shot because his firm was a contractor for the British Army and the Royal Ulster Constabulary (RUC). The IRA's other two victims were both Protestant members of the security forces, one from the RUC and the other from the Ulster Defence Regiment. Both were off duty when killed. The man killed by the UFF was a Sinn Féin councillor who was shot in his workplace. The man killed by the non-specific republican group was a Catholic civilian.
ground_truth: Fourteen people died