The SAS returned to Northern Ireland in force in 1976, operating throughout the province. In January 1977 Seamus Harvey, armed with a shotgun, was killed during a SAS ambush. On 21 June, six men from G Squadron ambushed four IRA men planting a bomb at a government building; three IRA members were shot and killed but their driver managed to escape. On 10 July 1978, John Boyle, a sixteen-year-old Catholic, was exploring an old graveyard near his family's farm in County Antrim when he discovered an arms cache. He told his father, who passed on the information to the Royal Ulster Constabulary (RUC). The next morning Boyle decided to see if the guns had been removed and was shot dead by two SAS soldiers who had been waiting undercover. In 1976 "Newsweek" also reported that eight SAS men had been arrested in the Republic of Ireland supposedly as a result of a navigational error. It was later revealed that they had been in pursuit of a Provisional Irish Republican Army unit.