January 1972: Soldiers from the Parachute regiment open fire on civilian demonstrators in Derry killing 13.

February 1972: An IRA car bomb targeted the Parachute Regiment’s English HQ, killing seven, mostly cleaners

April 1972 A report ordered by Prime Minister Ted Heath and carried out by an English judge, Lord Widgery. Carried out in a rush and without some evidence from eyewitnesses, it supports the army version of events. Many dismiss the report as a“whitewash”.

February 1992: As peace efforts are under way in Northern Ireland, there is a first meeting of the Bloody Sunday Justice Campaign.

February 1994: Conservative Prime Minister John Major Major refuses a bid for a new inquiry, citing the Lord Widgery report.

April 1996: The European Court of Human Rights rejects a campaign legal bid to secure an independent inquiry.

January 1998: New Labour premier Tony Blair orders a second inquiry in to Bloody Sunday

April 1998: The Good Friday Agreement is signed, paving the way for peace in Northern Ireland

April 1998. A new inquiry begins, under Lord Saville. It is to last 12 years and cost tens of millions of pounds.

June 2010: The final Saville report is published. It finds: “We found no instances where it appeared to us that soldiers either were or might have been justified in firing.”

Newly elected Conservative Prime Minister, David Cameron, apologises, saying the shootings were “both unjustified and unjustifiable”.

• July 2012: The Police Service of Northern Ireland launches a murder investigation in to Bloody Sunday.

• December 2016: Police report to to the Public Prosecution Service of Northern Ireland, which must decide whether or not to prosecute any Parachute Regiment soldiers.

• 14 March 2019: Prosecutors say they will bring charges against one paratrooper, Soldier F.