Newly declassified CIA documents show Osama bin Laden was weighing potential attacks on Britain as early as 1998, more than three years before the September 11 attacks — though the files stop short of showing a specific UK target had been chosen.
Newly declassified CIA documents have revealed that Osama bin Laden considered attacking Britain on its own soil years before the September 11 attacks. The papers, released by CIA director John Ratcliffe to mark the 25th anniversary of the atrocity, form part of the largest publication of 9/11-related intelligence files to date. The attacks in 2001 killed nearly 3,000 people, including 67 British citizens. Among the material is a memo from August 1998 showing that Bin Laden was weighing potential attacks against the UK, although no specific British target had yet been identified.
The August 1998 warning
A CIA memo dated 28 August 1998 stated that Bin Laden was looking at options for attacks against both the US and the UK. Crucially, the document explicitly noted that he had not yet identified precise targets or timing — meaning it established his interest in striking Britain, but not that any specific building, city or institution had already been chosen. The memo also suggested Bin Laden’s network was weighing retaliatory action in the hours before US cruise missile strikes hit Al-Qaeda bases in Afghanistan and Sudan.
A more explicit December warning
A further briefing, dated 11 December 1998, went further. It described a “significant near-term threat” from Bin Laden, stating there were “strong indications” he wanted to strike the US and its allies — including the UK and Israel — on their own soil. If those countries proved too well defended, the document warned, Al-Qaeda might instead target US and allied interests elsewhere that were easier to reach. This has been read as stronger evidence of a deliberate intention to attack Britain directly, rather than simply British assets abroad.
The same December briefing also referred to intelligence suggesting Bin Laden’s organisation was planning to hijack aircraft as part of forthcoming operations against the US. While striking with hindsight, given what took place on 11 September 2001, the document did not predict the specific plot that unfolded, nor did it identify the World Trade Center or the Pentagon as targets.
Britain as target and operating base
The declassified files also show that Al-Qaeda did not regard Britain purely as somewhere to attack. A later intelligence assessment described the UK as an important part of the group’s wider network, valuable for recruitment and for supporting terrorist activity abroad. Britain, in other words, was viewed simultaneously as a potential target and as a place where extremists could organise and operate.
That activity had consequences. A CIA document from August 1999 recorded Bin Laden’s anger after two of his operatives were arrested in London, noting that the arrests had damaged his organisation’s capabilities — evidence that British counter-terrorism efforts were affecting Al-Qaeda’s network well before 9/11.
Part of a wider pattern of warnings
By 2000, a CIA assessment described Bin Laden’s ideology as sanctioning attacks against Americans and their allies, noting that he regularly denounced the US, UK and Israel together. This helps explain why Britain featured in the intelligence picture even when operational attention was largely focused on America.
The August 1998 warning was not an isolated report. The newly released files show a sequence of CIA assessments stretching back earlier that year: concerns in February 1998 that Al-Qaeda was seeking weapons of mass destruction; a June 1998 briefing on potential attack targets; reports in July 1998 of plans for attacks inside the US; continued assessment of the threat from Bin Laden’s network in August; concern in September over attacks on US and European interests; and, by December, the warning of a serious near-term threat covering the US, UK and Israel together.
Context: the embassy bombings and missile strikes
The August 1998 briefing followed closely on from the 7 August bombings of US embassies in Kenya and Tanzania, which killed more than 200 people and injured thousands more. The Clinton administration responded on 20 August with cruise missile strikes against Al-Qaeda infrastructure in Afghanistan and Sudan. According to the newly released intelligence, Bin Laden was already considering retaliatory action around the time of those strikes.
Later assessments also detailed how Al-Qaeda’s ambitions extended beyond conventional bombings. One CIA analysis described an organisation capable of long-term planning, target surveillance and contingency planning, with an interest in bombings, assassinations, kidnappings, armed assaults and unconventional weapons.
Scale of the release — and its limits
In total, the CIA release comprises 71 President’s Daily Brief documents, 69 of which had never previously been made public. The agency has said the material offers a window into “the nation’s darkest moments” of that period. Beyond the UK-related files, the briefings cover a wide range of subjects, including chemical, biological and radiological weapons, potential attacks on US soil, aircraft hijackings, Al-Qaeda’s infrastructure in North America, Bin Laden’s location and intentions, threats to US and European interests, and the Taliban’s failure to restrain him.
Crucially, the documents were not written after the fact. They were contemporaneous briefings prepared for senior US officials, including presidents Bill Clinton and, later, George W. Bush, offering a genuine snapshot of what American intelligence knew and suspected at the time, rather than a retrospective assessment shaped by hindsight.
The files nonetheless stop short of showing that the 9/11 attacks could straightforwardly have been prevented. While they confirm that US agencies understood Bin Laden’s intent to attack America and its allies, and held specific warnings about possible methods, they generally lacked the precise operational detail — such as exact dates, aircraft or hijackers — that would have been needed to stop the plot. Former US counter-terrorism officials have described the material as evidence of a growing strategic warning, rather than proof that intelligence agencies held the complete 9/11 plan in advance.
