 INLA members, and current or former members of the Official IRA, were also allegedly involved.On 1 September 1975, a few days after two Catholic civilians were shot dead a short distance way in Altnamackan, the South Armagh Republican Action Force claimed responsibility for a gun attack on Tullyvallen Orange Hall near Newtownhamilton, County Armagh.The attack happened at about 10pm, when a group of Orangemen were holding a meeting inside.