Irish Republican Army on 29 March 1939 as part of its Sabotage Campaign, and by the Provisional IRA on 24 April 1996. On 19 July, security forces carried out a controlled explosion on a bomb left at Ealing Broadway station and public transport was disrupted when the Metropolitan Police closed Victoria and Paddington train stations and halted services on the London Underground. On 21 September a rocket-propelled grenade was fired at the MI6 headquarters using an RPG-22 rocket launcher, which generated headlines around the world. In November 2000, security forces foiled a plot to drive 500 lb of homemade explosives to central London that month, a bomb twice as powerful as the one in Omagh. At the time police were warning for weeks that a terrorist attack in London could be imminent. On 21 February 2001 a bomb disguised as a torch left outside a Territorial Army base in Shepherd's Bush seriously injured a 14-year-old cadet, who was blinded and had his hand blown off. A second attack in Shepherd's Bush, the 4 March BBC bombing, injured a civilian outside the BBC Television Centre. The explosion was captured by a BBC cameraman, and the footage was broadcast on TV stations worldwide, and gained mass publicity for the group. On 14 April a bomb exploded at a postal sorting office in Hendon, causing minor damage but no injuries. Three weeks later on 6 May a second bomb exploded at the same building, causing slight injuries to a passer-by. The 3 August 2001 Ealing bombing injured seven people, and on 3 November a car bomb containing 60 lb of home-made explosives was planted in the centre of Birmingham. The bomb did not fully detonate and no one was injured. Renewed campaign in Northern Ireland The successful attack on Hammersmith Bridge encouraged the RIRA leadership to launch further attacks in Northern Ireland. On 19 June 2000 a bomb was found in the grounds of Hillsborough Castle, home of Secretary of State for Northern Ireland Peter Mandelson. On 30 June a bomb exploded on the Dublin-to-Belfast railway line near the village of Meigh in County Armagh. The explosion damaged the tracks, and caused disruption to train services. On 9 July a car bomb damaged buildings in Stewartstown, County Tyrone including an RUC station, and on 10 August an attack in Derry was thwarted by the RUC after a van containing a 500 lb bomb