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| House of Commons bombing | |
|---|---|
| Title | House of Commons bombing |
| Partof | Troubles (Northern Ireland) |
| Location | Palace of Westminster, City of Westminster, London |
| Date | 10 May 1979 |
| Time | 14:05 BST |
| Target | House of Commons chamber and Parliament |
| Type | Bombing, terrorism |
| Injuries | 11 |
| Perpetrators | Provisional Irish Republican Army |
| Weapons | Time bomb |
House of Commons bombing
The 1979 Palace of Westminster bombing was a high-profile attack carried out in London that targeted the heart of the Parliament of the United Kingdom at the Palace of Westminster. The explosion occurred on 10 May 1979 during a period marked by heightened activity associated with the Troubles (Northern Ireland), and it intersected with national events including the aftermath of the 1979 United Kingdom general election and the premiership of Margaret Thatcher. The incident intensified debates involving Sinn Féin, Irish Republicanism, Conservative Party, and security arrangements around Westminster.
In the late 1970s, the Troubles (Northern Ireland) involved paramilitary campaigns by groups such as the Provisional Irish Republican Army against targets across Great Britain. Previous attacks included bombings in Birmingham, Guildford, and against members of British Armed Forces and Royal Ulster Constabulary. The period saw intersecting political developments: the recent 1979 United Kingdom general election that brought Margaret Thatcher to power, debates within Labour Party and Conservative Party about security policy, and negotiations involving British–Irish relations and the Anglo-Irish Agreement discussions. Security at iconic sites such as the Palace of Westminster and 10 Downing Street had been a focus following threats linked to Irish Republicanism and retaliatory actions involving Ulster Volunteer Force and other groups.
On 10 May 1979, a time device planted within the visitor area of the Palace of Westminster detonated in the afternoon, causing an explosion that shook the House of Commons precincts. The blast damaged stonework, glazing, and historic interiors associated with the medieval and Victorian fabric of the Palace of Westminster. The device was later attributed to the Provisional Irish Republican Army, which had conducted prior operations using timed explosive devices in urban settings such as Birmingham pub bombings and attacks on infrastructure including London Underground targets. The attack coincided with intense media coverage involving outlets such as the BBC and The Times, which reported on parliamentary security and the symbolic implications for the United Kingdom.
The explosion killed one person and injured eleven others, including parliamentary staff and visitors to the Palace of Westminster. Emergency responses were coordinated by the Metropolitan Police Service, London Fire Brigade, and London Ambulance Service, with injured persons taken to hospitals including St Thomas' Hospital and Charing Cross Hospital. The blast prompted the evacuation of adjacent chambers and temporary suspension of sittings at the Parliament, while conservation specialists from institutions such as the Victoria and Albert Museum and the Royal Commission on the Historical Monuments of England assessed damage to artworks and masonry. The incident intensified security scrutiny of visitor access points and circulation spaces used by MPs of constituencies such as City of Westminster and Westminster North.
The Metropolitan Police Service led the criminal investigation with support from the Royal Ulster Constabulary and intelligence-sharing with agencies involved in Northern Ireland, including MI5 and MI6 liaison channels. Forensic analysis of bomb fragments and timing mechanisms, alongside intelligence from informants and surveillance, pointed to the Provisional Irish Republican Army as the responsible organization. The IRA’s operational pattern—use of covert units, active service units, and overseas logistical support—had been documented in incidents such as the 1972 Aldershot bombing and other campaigns across England. Attribution relied on technical evidence and subsequent claims made in republican publications and statements circulated by groups linked to Sinn Féin and Provisional Irish Republican Army channels.
The bombing prompted urgent debates in both Houses, with MPs from the Conservative Party, Labour Party, and Liberal Party calling for strengthened protective measures. Discussions invoked historical precedents such as the security reforms after the Gunpowder Plot and more recent counterterrorism policies associated with the Prevention of Terrorism (Temporary Provisions) Act 1974. Security upgrades at the Palace of Westminster included revised access controls, screening of visitors, and collaboration between the Serjeant at Arms office and police counterterrorism units. The incident also influenced diplomatic exchanges between officials in London and Dublin, involving the Irish Government and the British–Irish Intergovernmental Conference track.
Prosecutions arising directly from the Palace of Westminster bombing were complicated by the clandestine nature of the Provisional Irish Republican Army and the difficulties in obtaining admissible evidence in court. While some arrests and trials related to contemporaneous bombing campaigns occurred in Crown Court venues such as the Old Bailey, convictions specifically linked to the 10 May attack relied on a combination of witness testimony, forensic linkage, and intelligence material. Legal frameworks applied included the Prevention of Terrorism (Temporary Provisions) Act 1976 and procedures within the English law criminal justice system, engaging prosecuting authorities such as the Crown Prosecution Service.
The bombing contributed to long-term changes in how the Palace of Westminster balanced public access with protection of historic parliamentary spaces. Subsequent security architecture evolved alongside restoration efforts that engaged the Royal Institute of British Architects and conservation bodies, and influenced later responses to attacks such as the 2017 Westminster attack. Memorialization included recognition of victims through parliamentary records and commemorations by associations of parliamentary staff and MPs from constituencies including City of London and Westminster. The event remains a referenced moment in studies of The Troubles, counterterrorism law, and heritage protection, cited in analyses by scholars linked to institutions such as King's College London and University College London.
Category:Attacks on the UK Parliament Category:Terrorist incidents in London Category:1979 in the United Kingdom