This followed the May 1882 Phoenix Park murders in Dublin of two representatives of the British government, Lord Frederick Cavendish and Thomas Henry Burke, by Irish nationalists. Cavendish was the newly appointed Chief Secretary for Ireland, and Burke was the Permanent Undersecretary, the most senior Irish civil servant. The assassination was carried out by members of the "Irish National Invincibles".
A year later four Invincibles or Irish sympathizers attacked a waxwork display of the murders at Allsopp's Waxworks Exhibition on Lime Street in Liverpool. The following was posted by my friend Howard Brown at JtR Forums.
Illustrated Police News, July 7, 1883