1990s-2001: A nuclear weapons network run by the father of the Pakistan nuclear weapons program, Abdul Qadeer Khan, supplies Iran, North Korea, and Libya with nuclear technologies and know-how. Nuclear bomb designs are found on the computer of a European supplier working with the Khan network. Al Qaeda reportedly contacts associates of Khan for assistance with their weapons program. The Khan network rejects them, for unknown reasons.
Nov. 7, 2001: Bin Laden states in an interview with Pakistani journalist Hamid Mir, "I wish to declare that if America used chemical or nuclear weapons against us, then we may retort with chemical and nuclear weapons. We have the weapons as a deterrent."
In the same interview, Zawahiri states, "If you have $30 million, go to the black market in central Asia, contact any disgruntled Soviet scientist, and a lot of dozens of smart briefcase bombs are available. They have contacted us, we sent our people to Moscow to Tashkent to other central Asian states, and they negotiated and we purchased some suitcase bombs."
Nov. 14, 2001: U.S. President George W. Bush meets with Russian President Vladimir Putin in Crawford, Texas. Bush presents a briefing on the proliferation threat posed by UTN. Bush asks Putin if he is certain that all Russian nuclear weapons and materials are secure. Putin responds that he can only vouch for the safety of nuclear materials since he gained power.
November 2001: Pakistan arrests Mahmood and many other members of UTN. Mahmood confesses that he met with bin Laden around a campfire that summer in Pakistan. He says they discussed how al Qaeda could build a nuclear device. He drew a very rough sketch of an improvised nuclear device, but advised bin Laden that it would be too hard to develop weapons-usable materials for it. Bin Laden reportedly said, "What if I already have them?"
November 2001: A search of UTN's Kabul office produces documents containing crude chemical, biological, radiological, and nuclear-related plans, including hand-written notes in Arabic and Internet-related searches.
December 2001: Malaysian authorities arrest Sufaat, the JI leader working with al Qaeda on nuclear weapons. Pakistani authorities arrest Ahmed, his Afghan counterpart, at his home in Islamabad. Ahmed confesses his involvement in the project and provides substantiating evidence.
January 2002: U.S. and Egyptian forces capture al Qaeda senior operative Ibn al-Shaykh al Libi. During interrogation by Egyptians, al Libi claims al Qaeda operatives received chemical, biological, radiological, and nuclear weapons training in Baghdad. He claims several small containers of nuclear material were smuggled into New York City by the Russian mafia. Al Libi later recants this statement.
March 2002: Russian special services assassinate Chechen leader Ibn al-Khattab, using poison, the kind of weapon he hoped to use against high-level Russian targets.
March 28, 2002: U.S. and Pakistani forces capture al Qaeda leader Abu Zubaydah in Faisalabad, Pakistan. During interrogation, he reveals a plot by an American associate of al Qaeda, Jose Padilla, to explode a "dirty bomb" in the United States. Padilla is subsequently identified and arrested in Chicago.
Spring 2002: In Khartoum, Sudan, a CIA officer meets with two senior al Qaeda associates, Mubarak al-Duri and Abu Rida Mohammed Bayazid, in a brokered arrangement. The CIA officer attempts to determine whether they were involved in al Qaeda's nuclear and biological weapons programs.
Bayazid, a founding member of al Qaeda, graduated from the University of Arizona with an advanced degree in physics. He was directly involved in al Qaeda's attempt to purchase uranium in 1993 and 1994. Al-Duri, an agronomist, also received his degree at the University of Arizona. He told the CIA officer, "Killing millions [of you] is justifiable by any means.... It is your doing. You made us what we are."
Summer 2002: Al Qaeda leaders in Saudi Arabia begin planning attacks against the royal family and Saudi oil assets. Nuclear and biological weapons-related references begin to appear in communications between top-level al Qaeda leaders and the Saudi cell.
Summer 2002: With bin Laden's blessing, al Qaeda issues two fatwas to justify an escalation of terrorism. One authorizes attacks on infidels other than Americans, including the Saudi royal family. The other justifies the use of WMD. Al Qaeda-associated extremists start to case Saudi targets, including the city of Ras al-Tanura and facilities belonging to oil giant Aramco.
June 2002: Extremists under Zarqawi's command conduct crude chemical and biological training and experiments in a remote camp, Khurmal, in northeastern Iraq. The commanders include men who served with Zarqawi at the Herat camp. Zarqawi has close ties with al Qaeda, but is an independent operator who never swore loyalty (bayat) to bin Laden.
July 10, 2002: Al Qaeda spokesman Sulayman Abu Ghayth al-Libi, under "house arrest" in Iran, says al Qaeda's fatwa justifies the use of WMD to kill four million Americans.
August 2002: CNN runs an exposé on al Qaeda's late-1990s experiments with crude toxins and poisons. Abu Khabab al-Masri led the gruesome efforts, testing the lethality of cyanide creams, ricin, mustard, sarin, and botulinum. A tape shows al Qaeda associates gassing dogs to death. Al-Masri later laments that his students did not take the training to heart by using the toxic weapons in terrorist attacks.
September - December 2002: Zarqawi associates infiltrate Turkey, Britain, Spain, Italy, France, Sweden, Germany, and other countries. They begin coordinating and planning ricin and cyanide attacks via a loose association of cells.
Bush and Vice President Dick Cheney receive briefings on the Zarqawi network's activities and plans to attack with poisons and toxins. Over the course of several briefings, U.S. knowledge of the extent of the network grows from a handful of terrorists in one country to dozens of extremists in 30 countries.
Jan. 5, 2003: In a bloody raid on a safehouse, Britain arrests seven extremists plotting to use ricin poison on the London Underground. This represents the first in a wave of arrests of Zarqawi-network terrorists in Britain, continental Europe, and beyond. The arrests confirm intelligence reports, producing forensic evidence of planning for crude-poison and toxin attacks.
January - March 2003: Zarqawi-associated operatives are arrested, disrupting ricin and cyanide attacks, in Britain, Spain, Italy, and France.
Feb. 5, 2003: U.S. Secretary of State Colin Powell gives a speech to the U.N. Security Council, naming the Herat camp leadership, including Zarqawi. He identifies poison-attack cells across Europe.
February - March 2003: Zarqawi returns to Baghdad to prepare for an insurgency to meet the U.S. invasion of Iraq.
March 1, 2003: 9/11 mastermind Khalid Sheikh Mohammed (KSM) is captured in Pakistan. Confronted with the evidence found during the raid, KSM confirms some details of al Qaeda's nuclear and biological weapons programs. He later recants some of his testimony.
March 2003: Zawahiri calls off an attack that had been planned against the New York City subway system, in lieu of "something better." Al Qaeda associates from Bahrain had cased the subway system in December 2002 and planned an attack with a homemade cyanogen gas-releasing device called a "mobtaker."
March-May 2003: Al Qaeda Saudi senior operative Abu Bakr communicates with Iran-based al Qaeda senior members, including the chief of operations. They plan to purchase three "Russian nuclear devices." An unidentified Pakistan specialist is enlisted to verify the goods.
May 21, 2003: Radical Saudi cleric Nasir al-Fahd writes a fatwa justifying the use of WMD. Another radical cleric, Ali al-Khudair, endorses it.
May 28, 2003: The Saudi intelligence agency makes a series of arrests in a campaign to neutralize al Qaeda in Saudi Arabia and eliminate its capacity to mount attacks. Al-Fahd is arrested. Cyanide is found in an al Qaeda safehouse in Riyadh.
June 26, 2003: An Armenian citizen, Garik Dadayan, is caught with 170 grams of highly enriched uranium on the Georgia-Armenia border. This is allegedly a sample of a larger cache, due to be sold to an unknown customer, possibly in the Middle East.
Aug. 13, 2003: Riduan Isamuddin, the head of JI, is arrested. He provides confirmation of his role in the anthrax program.
After August 2003, it is not possible to extend the chronology without excluding considerable information that is sensitive or classified. Even though the passage of time has enabled more of the story of al Qaeda's WMD efforts to be told, much detail remains too sensitive to reveal, even in the years covered by this chronology. It is not the author's intent to reveal information that might frustrate efforts to identify and neutralize al Qaeda's ongoing efforts to develop weapons of mass destruction. Rather, it is his hope that an accurate portrayal of a compact period in the recent past would enable the reader to develop an understanding of the intensity of al Qaeda's interest in WMD, as well as an appreciation for the U.S. government's response to it.
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Rolf Mowatt-Larssen is a senior fellow at Harvard Kennedy School's Belfer Center for Science and International Affairs. Prior to his appointment at Harvard, he led the government's efforts at the Department of Energy and the Central Intelligence Agency to find and track potential nuclear terrorists and to prevent a nuclear terrorist attack on the U.S. An expanded version of this introduction and timeline are available here.
http://www.foreignpolicy.com/articles/2010/01/25/al_qaedas_pursuit_of_weapons_of_mass_destruction