A pigeon flies past a mural supporting the Irish Republican Army (IRA) in the Ardoyne area of north Belfast, September 9, 2015. Britain's secretary of state for Northern Ireland's Theresa Villiers is taking part in another round of cross-party talks at Stormont later today with the aim of resolving the crisis over a murder linked to the Irish Republican Army (IRA). REUTERS/Cathal McNaughton 

A man walks past a mural supporting the Irish Republican Army (IRA) in the Ardoyne area of north Belfast, September 9, 2015. Britain's secretary of state for Northern Ireland's Theresa Villiers is taking part in another round of cross-party talks at Stormont later today with the aim of resolving the crisis over a murder linked to the Irish Republican Army (IRA). REUTERS/Cathal McNaughton 

The Starry Plough flag is etched onto a gravestone near the Republican plot in Milltown cemetery, West Belfast August 18, 2014. The Starry Plough was originally used by the Irish Citizen Army, a socialist, Republican movement and in modern times has been adopted by various Republic Paramilitary groups. In Belfast, the flags of Israel and the Palestinians are potent symbols of conflict, but they divide Catholics and Protestants rather than Jews and Muslims. In the complex web of alliances that underpins Northern Ireland politics, the star of David has been adopted by pro-British Loyalists, mainly Protestants, many of whom sympathise with Israel's struggle against Islamic militants. Flying the green, black and red of flag of the Palestinian territories, meanwhile, is a sign of support for Catholic Irish Nationalism and their aspiration for a united Ireland against what many see as a British occupation. The flags are among dozens that have been adopted by the working class Catholic and Protestant areas that have for decades been at the focus of sectarian violence in Northern Ireland. Picture taken August 18, 2014. REUTERS/Cathal McNaughton (NORTHERN IRELAND - Tags: POLITICS CIVIL UNREST MILITARY)

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A flag bearing the emblem of the Special Air Services (SAS) flies in the Loyalist Tigers Bay area of North Belfast August 19, 2014. Loyalists fly the flag to show support for the British Special Forces group which carried out operations against Republican Paramilitaries. In Belfast, the flags of Israel and the Palestinians are potent symbols of conflict, but they divide Catholics and Protestants rather than Jews and Muslims. In the complex web of alliances that underpins Northern Ireland politics, the star of David has been adopted by pro-British Loyalists, mainly Protestants, many of whom sympathise with Israel's struggle against Islamic militants. Flying the green, black and red of flag of the Palestinian territories, meanwhile, is a sign of support for Catholic Irish Nationalism and their aspiration for a united Ireland against what many see as a British occupation. The flags are among dozens that have been adopted by the working class Catholic and Protestant areas that have for decades been at the focus of sectarian violence in Northern Ireland. Picture taken August 19, 2014. REUTERS/Cathal McNaughton (NORTHERN IRELAND - Tags: POLITICS CIVIL UNREST MILITARY)

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A member of a Republican band takes part in a parade commemorating dead IRA members in the village of Castlederg, in County Tyrone August 11, 2013. REUTERS/Cathal McNaughton (NORTHERN IRELAND - Tags: CIVIL UNREST POLITICS SOCIETY RELIGION) 

A mural in the Bogside area of Derry commemorates the beginning of the struggle in Derry for democratic rights, February 21, 2013. Historically most of the hundreds of murals across Northern Ireland promoted either republican or loyalist political beliefs, often glorifying paramilitary groups such as the Irish Republican Army or the Ulster Volunteer Force, or commemorating people who lost their lives in paramilitary or military attacks. However, since the paramilitary ceasefires some of the paintings have become less sectarian, celebrating sporting successes and cultural achievements. Picture taken February 21, 2013.

REUTERS/Cathal McNaughton (BRITAIN - Tags: SOCIETY)

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A mural in the Bogside area of Derry City depicts a petrol bomber during the Battle of the Bogside which took place in 1969 between residents of the area and the Royal Ulster Constabulary, February 19, 2013. Historically most of the hundreds of murals across Northern Ireland promoted either republican or loyalist political beliefs, often glorifying paramilitary groups such as the Irish Republican Army or the Ulster Volunteer Force, or commemorating people who lost their lives in paramilitary or military attacks. However, since the paramilitary ceasefires some of the paintings have become less sectarian, celebrating sporting successes and cultural achievements. Picture taken February 19, 2013.

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A mural in the Bogside area of Derry City depicts a petrol bomber during the Battle of the Bogside which took place in 1969 between residents of the area and the Royal Ulster Constabulary, February 19, 2013. Historically most of the hundreds of murals across Northern Ireland promoted either republican or loyalist political beliefs, often glorifying paramilitary groups such as the Irish Republican Army or the Ulster Volunteer Force, or commemorating people who lost their lives in paramilitary or military attacks. However, since the paramilitary ceasefires some of the paintings have become less sectarian, celebrating sporting successes and cultural achievements. Picture taken February 19, 2013.

REUTERS/Cathal McNaughton (BRITAIN - Tags: SOCIETY)

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A man checks his mobile phone beside a loyalist paramilitary mural in the Waterside area of Derry, February 22, 2013. Historically most of the hundreds of murals across Northern Ireland promoted either republican or loyalist political beliefs, often glorifying paramilitary groups such as the Irish Republican Army or the Ulster Volunteer Force, or commemorating people who lost their lives in paramilitary or military attacks. However, since the paramilitary ceasefires some of the paintings have become less sectarian, celebrating sporting successes and cultural achievements. Picture taken February 22, 2013.

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A mural in the Bogside area of Derry commemorates the beginning of the struggle in Derry for democratic rights, February 21, 2013. Historically most of the hundreds of murals across Northern Ireland promoted either republican or loyalist political beliefs, often glorifying paramilitary groups such as the Irish Republican Army or the Ulster Volunteer Force, or commemorating people who lost their lives in paramilitary or military attacks. However, since the paramilitary ceasefires some of the paintings have become less sectarian, celebrating sporting successes and cultural achievements. Picture taken February 21, 2013.

REUTERS/Cathal McNaughton (BRITAIN - Tags: SOCIETY)

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A mural in the village of Cushendall in north Antrim commemorates 100 years of the local Gaelic Athletic Club, February 20, 2013. Historically most of the hundreds of murals across Northern Ireland promoted either republican or loyalist political beliefs, often glorifying paramilitary groups such as the Irish Republican Army or the Ulster Volunteer Force, or commemorating people who lost their lives in paramilitary or military attacks. However, since the paramilitary ceasefires some of the paintings have become less sectarian, celebrating sporting successes and cultural achievements. Picture taken February 20, 2013.

REUTERS/Cathal McNaughton (BRITAIN - Tags: SOCIETY)

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Pigeons fly past a mural in the Shankill Road area of West Belfast depicting a Gaelic myth about the claiming of Ulster, February 20, 2013. Historically most of the hundreds of murals across Northern Ireland promoted either republican or loyalist political beliefs, often glorifying paramilitary groups such as the Irish Republican Army or the Ulster Volunteer Force, or commemorating people who lost their lives in paramilitary or military attacks. However, since the paramilitary ceasefires some of the paintings have become less sectarian, celebrating sporting successes and cultural achievements. Picture taken February 20, 2013.

REUTERS/Cathal McNaughton (BRITAIN- Tags: SOCIETY)

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Loyalist paramilitary and political murals are pictured in the Shankill Road area of West Belfast, February 20, 2013. Historically most of the hundreds of murals across Northern Ireland promoted either republican or loyalist political beliefs, often glorifying paramilitary groups such as the Irish Republican Army or the Ulster Volunteer Force, or commemorating people who lost their lives in paramilitary or military attacks. However, since the paramilitary ceasefires some of the paintings have become less sectarian, celebrating sporting successes and cultural achievements. Picture taken February 20, 2013.

REUTERS/Cathal McNaughton (BRITAIN Tags: SOCIETY)

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Golfer Rory McIlroy is pictured on a wall in the Holylands area of Belfast, February 23, 2013. Historically most of the hundreds of murals across Northern Ireland promoted either republican or loyalist political beliefs, often glorifying paramilitary groups such as the Irish Republican Army or the Ulster Volunteer Force, or commemorating people who lost their lives in paramilitary or military attacks. However, since the paramilitary ceasefires some of the paintings have become less sectarian, celebrating sporting successes and cultural achievements. Picture taken February 23, 2013.

REUTERS/Cathal McNaughton (BRITAIN- Tags: SOCIETY)

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A mural shows the apparition of the Virgin Mary to six Catholics in the town of Medjugorje in Bosnia and Herzegovina in the Ardoyne area of North Belfast, February 20, 2013. Historically most of the hundreds of murals across Northern Ireland promoted either republican or loyalist political beliefs, often glorifying paramilitary groups such as the Irish Republican Army or the Ulster Volunteer Force, or commemorating people who lost their lives in paramilitary or military attacks. However, since the paramilitary ceasefires some of the paintings have become less sectarian, celebrating sporting successes and cultural achievements. Picture taken February 20, 2013.

REUTERS/Cathal McNaughton (BRITAIN - Tags: SOCIETY)

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People walk past a Loyalist Paramilitary mural in the Shankill Road area of West Belfast, February 20, 2013. Historically most of the hundreds of murals across Northern Ireland promoted either republican or loyalist political beliefs, often glorifying paramilitary groups such as the Irish Republican Army or the Ulster Volunteer Force, or commemorating people who lost their lives in paramilitary or military attacks. However, since the paramilitary ceasefires some of the paintings have become less sectarian, celebrating sporting successes and cultural achievements. Picture taken February 20, 2013.

REUTERS/Cathal McNaughton (BRITAIN - Tags: SOCIETY)

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A mural features Irish boxer Michael Conlan winning a bronze medal in the flyweight division at the 2012 Summer Olympics on a wall in the Falls road area of West Belfast February 23, 2013. Historically most of the hundreds of murals across Northern Ireland promoted either republican or loyalist political beliefs, often glorifying paramilitary groups such as the Irish Republican Army or the Ulster Volunteer Force, or commemorating people who lost their lives in paramilitary or military attacks. However, since the paramilitary ceasefires some of the paintings have become less sectarian, celebrating sporting successes and cultural achievements. Picture taken February 23, 2013.

REUTERS/Cathal McNaughton (BRITAIN - Tags: SOCIETY)

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A mural on the Shankill road shows tributes to Britain's Queen Elizabeth in West Belfast, February 21, 2013. Historically most of the hundreds of murals across Northern Ireland promoted either republican or loyalist political beliefs, often glorifying paramilitary groups such as the Irish Republican Army or the Ulster Volunteer Force, or commemorating people who lost their lives in paramilitary or military attacks. However, since the paramilitary ceasefires some of the paintings have become less sectarian, celebrating sporting successes and cultural achievements. Picture taken February 21, 2013.

REUTERS/Cathal McNaughton (BRITAIN - Tags: SOCIETY)

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A mural in the Bogside area of Derry City depicts Operation Motorman, February 21, 2013. Historically most of the hundreds of murals across Northern Ireland promoted either republican or loyalist political beliefs, often glorifying paramilitary groups such as the Irish Republican Army or the Ulster Volunteer Force, or commemorating people who lost their lives in paramilitary or military attacks. However, since the paramilitary ceasefires some of the paintings have become less sectarian, celebrating sporting successes and cultural achievements. Picture taken February 21, 2013.

REUTERS/Cathal McNaughton (BRITAIN - Tags: SOCIETY)

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Britain's Queen Elizabeth shakes hands with Northern Ireland deputy first minister Martin McGuinness, watched by first minister Peter Robinson (C) at the Lyric Theatre in Belfast June 27, 2012. Queen Elizabeth shook the hand of former Irish Republican Army (IRA) commander McGuinness for the first time on Wednesday, drawing a line under a conflict that cost the lives of thousands of soldiers and civilians, including that of her cousin. REUTERS/Paul Faith/pool (NORTHERN IRELAND - Tags: ROYALS SOCIETY POLITICS CIVIL UNREST) 

A dissident republican colour party parades through Derry's Creggan housing estate on their way to a Republican Memorial service in the city April 5, 2010. REUTERS/Cathal McNaughton (NORTHERN IRELAND - Tags: CIVIL UNREST) 

A statue of a Republican paramilitary is displayed in the Open Window art studio workshop in Belfast, Northern Ireland, November 17, 2009. REUTERS/Cathal McNaughton (NORTHERN IRELAND ENTERTAINMENT CONFLICT) 

A member of the Real IRA reads a statement at a Republican memorial in the Creggan area of Derry, Northern Ireland, April 13, 2009. The Real IRA, a splinter paramilitary group of the Irish Republican Army, have claimed responsibility for the murders of two soldiers at an Army Barracks in Antrim last month. REUTERS/Cathal McNaughton (NORTHERN IRELAND CONFLICT POLITICS HEADSHOT) 

A member of the Real IRA reads a statement at a Republican memorial in the Creggan area of Derry, Northern Ireland, April 13, 2009. The Real IRA, a splinter paramilitary group of the Irish Republican Army, have claimed responsibility for the murders of two soldiers at an Army Barracks in Antrim last month. REUTERS/Cathal McNaughton (NORTHERN IRELAND CONFLICT POLITICS HEADSHOT) 

A member of the Real IRA (3rd L) is applauded as he makes his way through the crowd to read a statement at a Republican memorial in the Creggan area of Derry, Northern Ireland, April 13, 2009. The Real IRA, a splinter paramilitary group of the Irish Republican Army, have claimed responsibility for the murders of two soldiers at an Army Barracks in Antrim last month. REUTERS/Cathal McNaughton (NORTHERN IRELAND CONFLICT POLITICS) 

A member of the Real IRA is applauded as he makes his way through the crowd to read a statement at a Republican memorial in the Creggan area of Derry, Northern Ireland, April 13 2009. The Real IRA, a splinter paramilitary group of the Irish Republican Army, have claimed responsibility for the murders of two soldiers at an Army Barracks in Antrim last month. REUTERS/Cathal McNaughton (NORTHERN IRELAND CONFLICT POLITICS) 

A masked youth holds petrol bombs as he stands near a Republican memorial in the Creggan area of Derry, Northern Ireland, where a member of the Real IRA was reading a statement, April 13 2009. The Real IRA, a splinter paramilitary group of the Irish Republican Army, have claimed responsibility for the murders of two soldiers at an Army Barracks in Antrim last month. REUTERS/Cathal McNaughton (NORTHERN IRELAND CONFLICT POLITICS) 

George Churchill Coleman (R), commander of the police anti-terrorist squad surveys the scene after a bomb exploded in the Soho area of London April 6, 1992. There were no casualties in the blast and no warning was given. REUTERS/Andre Camara (BRITAIN) 

A woman walks past an Irish Republican mural challenging the policing issue in Northern Ireland on the Falls Road in west Belfast in this April 28, 2003 file photo. Despite the repeated failure of Northern Ireland's politicians to agree on how the province should be governed, the local signs of normalisation are everywhere apparent with policemen increasingly patrolling on bike and on foot and community groups working to tone down provocative displays of allegiance to paramilitary groups. To match feature IRISH COMMUNITY REUTERS/Paul McErlane/Files (NORTHERN IRELAND) 

An armed police officer holds his self-loading carbine at a new security check point as tourists look on and miss their first glance of London's St Paul's Cathedral, July 3, 1993. Security check points have been set up in London's financial City district to try and prevent a repetition of the blockbuster IRA bomb which wrecked the area earlier this year. REUTERS/Andre Camara 

Independent Monitoring Commission (IMC) members, former Metropolitan Police deputy assistant commissioner John Grieve (L) former Northern Ireland Assembly Speaker Lord Alderdice (C) and former Secretary General of the Department of Justice in Dublin, Joe Brosnan, conduct a news conference on the IMC's recent report into paramilitary groups in Belfast, April 20, 2004. The report said that paramilitary activity on the part of both republican and loyalist groups was disturbingly high. REUTERS/Paul McErlane PM/DW/AA 

Independent Monitoring Commission (IMC) member and former Secretary General of the Department of Justice in Dublin, Joe Brosnan, listens during a news conference on the IMC's recent report into paramilitary groups in Belfast, April 20, 2004. The report said that paramilitary activity on the part of both republican and loyalist groups was disturbingly high. REUTERS/Paul McErlane PM/DW/AA 

Independent Monitoring Commission (IMC) member and former Northern Ireland Assembly Speaker Lord Alderdice addresses a news conference on the IMC's recent report into paramilitary groups in Belfast, April 20, 2004. The report said that paramilitary activity on the part of both republican and loyalist groups was disturbingly high. REUTERS/Paul McErlane PM/DW/AA 

Former CIA chief Richard Kerr speaks during a news conference on Independent Monitoring Commission (IMC) report into paramilitary groups still involved in violence, Belfast, Northern Ireland, April 20, 2004. Northern Ireland's biggest Catholic political party, Sinn Fein, is to be hit with financial sanctions over alleged Irish Republican Army (IRA) violence afterthe IMC's report published on Tuesday said key members hold senior ranks in the outlawed guerrilla group. REUTERS/Paul McErlane PM/DW/CRB 

Staff from the Royal Victoria Hospital in Belfast, Northern Ireland,
stop work to protest about paramilitary death threats made against
them, August 6, 2002. Trade union officials held emergency talks to
discuss growing intimidation from republican and loyalist paramilitary
groups after telephone threats were made against six unnamed workers
who had links with the security forces. REUTERS/Paul McErlane

PM 

Staff from the Royal Victoria Hospital in Belfast, Northern Ireland, stop work to protest about paramilitary death threats made against them, August 6, 2002. Trade union officials held emergency talks to discuss growing intimidation from republican and loyalist paramilitary groups after telephone threats were made against six unnamed workers who had links with the security forces. REUTERS/Paul McErlane

PM 

A man wheels a rubbish bin past freshly painted graffiti from the republican dissident paramilitary group, the Continuity Irish Republican Army (CIRA) on an alley wall in West Belfast, on the day that power was handed over to the recently elected power sharing executive, December 2. The CIRA are a breakaway faction of the IRA, and continue to reject the peace process discussed and agreed by politicians. ??» 

A man wheels a rubbish bin past freshly painted graffiti from the republican dissident paramilitary group, the Continuity Irish Republican Army (CIRA) on an alley wall in West Belfast, on the day that power was handed over to the recently elected power sharing executive, December 2. The CIRA are a breakaway faction of the IRA, and continue to reject the peace process discussed and agreed by politicians.

PM/HP 

Freshly painted graffiti from the republican dissident paramilitary group, the Continuity Irish Republican Army (CIRA) adorns an alley wall in West Belfast, on the day that power is handed over to the recently elected power sharing executive, December 2. The CIRA are an offshoot of the IRA and continue to reject the peace process discussed and agreed by politicians.

PM/HP/ME 

A coffin of one of the three boys killed in the Omagh bomb is taken to the graveyard for burial at St Mary's church in Buncrana August 19. Twenty-eight people died when a massive bomb was detonated in the centre of Omagh on Saturday. A dissident Republican group have claimed responsibility for the attack, which is the worst in the history of the troubles of Northern Ireland.

IW/JDP 

WORKMEN WEARING PROTECTIVE CLOTHING START MASSIVE CLEANUP OPERATIONS IN BISHOPSGATE, LONDON, FOLLOWING BOMB BLAST. Workmen wearing protective clothing against falling glass start the massive cleanup operations in Bishopsgate, April 25, 1993, after the bomb blast that ripped through the financial heartland of London. SCANNED FROM NEGATIVE REUTERS/Stringer 

WORKMEN WEARING PROTECTIVE CLOTHING START MASSIVE CLEANUP OPERATIONS IN BISHOPSGATE, LONDON, FOLLOWING BOMB BLAST. Workmen wearing protective clothing against falling glass start the massive cleanup operations in Bishopsgate, April 25, 1993, after the bomb blast that ripped through the financial heartland of London. SCANNED FROM NEGATIVE REUTERS/Stringer 

The bomb damaged blast area of the City of London after two bomb blasts ripped through the City of London April 24, 1993. At least 30 people were injured in the blast. REUTERS/Andre Camara AC 

The bomb damaged area of the City of London is seen in this April 24, 1993 file photo after two blasts ripped through a few of the the buildings in the area. Dozens of poeple were injured in the blast. SCANNED FROM NEGATIVE REUTERS/Andre Camara AC/CMC