The dirty secret of 9/11 for the UK is that its intelligence and ‘security’ agencies collaborated with Islamist extremist/terrorist groups both before and after the attacks. Here's a thread on some of the most important episodes. https://bit.ly/3E1USDM

2/In 1999 Kosovo war UK trained KLA militants, who worked closely with al-Qaida. Training took place at camps where jihadist fighters also had their military centre. One KLA unit at the time was led by the brother of Ayman al-Zawahiri, Bin Laden’s deputy. https://bit.ly/3yUQ5Ap

3/ UK funded Egypt's Muslim Brotherhood as early as 1942 and connived with it in 1950s to counter Nasser, the leading Arab nationalist. When Britain invaded in 1956, it made secret contacts with the MB as part of plans to overthrow or assassinate Nasser https://bit.ly/3hmEYdz

4/ In 1990s, UK hosted many Islamist groups in "Londonistan", including Bin Laden’s office in 1994-8. This in effect sent a ‘green light’ from Whitehall to terrorism abroad, consistent with the UK's use of radical Islamic groups in foreign policy. https://bit.ly/2X9bgl2

5/ The 1953 MI6/CIA coup to overthrow Musaddiq in Iran involved plotting with Shia Islamists, the predecessors of Ayatollah Khomeini. Ayatollah Kashani was backed and funded by Britain to organize opposition and demonstrations against Musaddiq. https://bit.ly/38WmCvq

6/ UK/US covertly supported Islamist insurgents to overthrow nationalist Indonesian leader Sukarno in the late 1950s. Arms/aid were given to the rebels, which included the Darul Islam movement that had proclaimed Islamic states in the Indonesian islands. https://bit.ly/3C2eshd

7/ UK secretly backed the Afghan mujahidin before the Soviet invasion of 1979 and continued its largest covert operation since WW2 during 1980s, arming and aiding various Islamist groups, and aiding secret operations inside the USSR. https://bit.ly/3nlM6L8

8/The 2005 London bombers had links with violent Islamist groups such as the Harkat ul-Mujahidin whose militants were previously covertly supported by the UK and US. These militants had been long covertly sponsored by UK-backed Pakistan. https://bit.ly/2YKWqlx

9/ In 1996 MI6 secretly funded the al-Qaida ally, the Libyan Islamic Fighting Group, to assassinate Gaddafi. https://bit.ly/3z1TFbZ

10/The UK backed Islamist militants to overthrow Gaddafi in Libya in 2011, with massive arms/aid from Qatar. Rebels included Libyans who'd previously fought with IS in Iraq and 4 fighters who went on to murder dozens of Britons in terrorist attacks. https://bit.ly/3hmKDAd

11/After 2011/12 the UK covertly supported Syrian rebels as part of huge Arab/US operation to overthrow Assad regime, working alongside extremist/jihadist groups, and prolonging the war. https://bit.ly/3C4U3IJ / https://bit.ly/2XdsLRl