Ahmad Shah Massoud, known as the "Lion of Panjshir," was a longtime Afghan guerrilla commander who had fought against successive Afghan governments, Soviet occupation, and later the Taliban. By 2001 he led the military forces of the Northern Alliance, which held territory in northern Afghanistan against the Taliban regime and its Pakistani backers. Massoud was a vocal public critic of Pakistan's Inter-Services Intelligence (ISI) and of Osama bin Laden's al-Qaeda network, including in a 5 April 2001 address to the European Parliament in Strasbourg, in which he warned that unresolved extremism in Afghanistan would eventually "affect the United States and a lot of other countries."
Bin Laden responded to Massoud's public criticism by soliciting followers to "deal with" him. Al-Qaeda figures Ayman al-Zawahiri and Abu Hani al-Masri organized the operation from Taliban-controlled Afghanistan. Two Tunisian men, Abd as-Sattar Dahmane and Rachid Bouari el-Ouaer, were recruited in Europe and brought to Afghanistan, where they trained at al-Qaeda's Darunta camp. They were given a television camera stolen months earlier from a French cameraman in Grenoble; its battery belt was packed with explosives. Using a fraudulent letter purporting to be from a London-based Islamic organization, and with the help of a forged introduction relayed through Northern Alliance figure Abdul Rasul Sayyaf, the two men obtained access to Northern Alliance territory, where Taliban escorts guided them to the Panjshir Valley before Northern Alliance officials moved them onward. They spent roughly a month seeking an interview with Massoud, eventually reaching his rear headquarters in Khwaja Bahauddin.
On 9 September 2001, Massoud agreed to sit for the interview. During the session, as an interpreter began translating the first question, el-Ouaer detonated the explosives concealed in the camera equipment. Both attackers were killed instantly. Massoud was severely wounded and evacuated by helicopter to a military medical clinic in Farkhor, Tajikistan, where he was pronounced dead on arrival.
Massoud's inner circle, including intelligence officials and foreign-government liaisons from the CIA, Russia's FSB, Iran's IRGC and VEVAK, India's RAW, Tajikistan's SCNS, and Uzbekistan's NSS, deliberately concealed his death for a period to prevent a collapse of Northern Alliance morale and a Taliban advance. Public confirmation of his death followed within days, overtaken by the 11 September 2001 attacks in the United States two days later. Al-Qaeda claimed responsibility for the assassination. Debate continues, without resolution, over whether Pakistan's ISI had covert knowledge of or complicity in the operation, and over whether the timing relative to the September 11 attacks was intentional; available evidence is insufficient to prove or disprove a coordinated timing.