On 30 January 1972 in the Northern Ireland town of Derry a Civil Rights protest march led by activist Ivan Cooper was fired upon by British troops, killing 13 protesters and wounding 14 more, one of whom subsequently died.

It was a major incident and unsurprisingly marked an escalation in the conflict with the ranks of the IRA being swelled as Irish citizens responded in horror and anger.

The event was made into a reenactment 107-minute docudrama in 2002, Bloody Sunday.

Fortunately, today things have much changed for the better.

Here is a video published on Friday by political party Sinn Fein.