The Independent Commission for Reconciliation and Information Recovery (ICRIR) has begun a witness appeal that includes distributing posters and leaflets in Armagh as part of its investigation into the death of Margaret "Ruby" Johnston in 1972.

Ms Johnston, a 38-year-old woman, was travelling home from work on an Ulsterbus on Saturday 5 February 1972. She boarded the number 56 Newtownhamilton service at around 4.20pm and sat in the front passenger seat opposite the driver.

At approximately 4.30pm, the bus slowed at the junction of Friary Road and Lower Irish Street. A crowd of about 60 people attacked the vehicle, throwing stones through windows and two petrol bombs. One bomb exploded in the aisle. The second struck the front window where Ms Johnston was seated, engulfing her in flames.

She suffered severe burns and was taken to Armagh City Hospital. She died of her injuries on 28 March 1972.

Assistant commissioner Amanda Logan, who is leading the investigation, described Ms Johnston as deeply loved and cherished by her family. She said the death remains devastating and its impact is still felt. Ms Logan stated that the family has endured more than 50 years without answers and that it is time they received the truth.

The commission has urged anyone who witnessed the attack or has relevant information to come forward. Ms Logan promised that all information would be treated in the strictest confidence. She noted that previous witness appeals had generated new leads and expressed hope that this one would do the same.

The poster and leaflet distribution is aimed at reaching people in the areas connected to the investigation.