The Kingsmill massacre occurred at 5:30 PM on 5 January 1976 when the Provisional IRA stopped a minibus carrying eleven Protestant workmen in Kingsmill, County Armagh, Northern Ireland and killed ten of them, injuring one. The massacre was a revenge attack for the killings of the Reavey and O'Dowd families in County Armagh by the Ulster Volunteer Force, and the Kingsmill massacre was one of the deadliest mass shootings of The Troubles, coming at a time when the Ulster unionists and IRA supporters carried out revenge attacks against each other.