September 11, 2001, attacks
Main article: September 11 attacks
The most destructive act ascribed to al-Qaeda was the series of attacks in the United States on September 11, 2001. These attacks destroyed the World Trade Center, damaged the Pentagon and crashed another plane in a series of suicide hijacking of airplanes. Osama bin Laden had denied his involvement in the attack, but in 2004 admitted he was responsible.
April 2002 Ghriba bombing
Main article: Ghriba synagogue bombing
On April 11, 2002, a natural gas truck fitted with explosives drove past security barriers at the ancient Ghriba Synagogue on the Tunisian island of Djerba. The truck detonated at the front of the synagogue, killing 14 German tourists, three Tunisians, and two French nationals. More than 30 others were wounded. Al Qaeda later claimed responsibility for the attack.
October 2002 Limburg bombing
The 2002 Limburg bombing occurred on 6 October, 2002. The Limburg was carrying 397,000 barrels (63,100 m3) of crude oil from Iran to Malaysia, and was in the Gulf of Aden off Yemen to pick up another load of oil. It was registered under a French-flag and had been chartered by the Malaysian petrol firm Petronas. While it was some distance offshore, an explosives-laden dinghy rammed the starboard side of the tanker and detonated. The vessel caught on fire and approximately 90,000 barrels (14,000 m3) of oil leaked into the Gulf of Aden. Although Yemeni officials initially claimed that the explosion was caused by an accident, later investigations found traces of TNT on the damaged ship. One crew member, a 38 year-old Bulgarian named Atanas Atanasov, was killed, and 12 other crew members were injured. 
October 2002 Bali bombings
Main article: 2002 Bali bombings
The 2002 Bali bombings occurred on 12 October 2002 in the tourist district.
November 2002 Mombasa attacks
Main article: 2002 Mombasa attacks
The 2002 Mombasa attacks occurred on 28 November 2002 in Kenya. Al Qaeda later claimed responsibility for the attacks.
May 2003 Riyadh bombing
Main article: Riyadh compound bombings
The 2003 Riyadh compound bombings occurred on 12 May 2003, in Riyadh, Saudi Arabia. 36 people were killed, and over 160 wounded.
May 2003 Casablanca bombings
Main article: 2003 Casablanca bombings
The 2003 Casablanca bombings occurred on May 16, 2003 in Casablanca, Morocco. 45 people were killed as a result of these attacks (12 suicide-bombers and 33 victims).
August 2003 Jakarta bombing
Main article: 2003 Marriott Hotel bombing
The 2003 Jakarta bombing occurred on August 5, 2003 in Jakarta, Indonesia. A suicide bomber detonated a car bomb outside the lobby of the JW Marriott Hotel, killing twelve people and injuring 150. Those killed were mostly Indonesian, with the exception of one Dutch.
November 2003 Istanbul attacks
Main article: 2003 Istanbul bombings
The 2003 Istanbul bombings were four truck bomb attacks carried out on November 15, 2003 and November 20, 2003, in Istanbul, Turkey, leaving 67 people dead, and 700 wounded. Several men have been convicted for their involvement.
March 2004 Madrid attacks
Main article: 2004 Madrid train bombings
The March 11, 2004 Madrid train bombings was an Islamist terrorist attack in Madrid (Spain) that killed 191 people and wounded more than 2,000. The terror cell had links to Al Qaeda. It was the worst Islamist attack in European history.
May 2004 Khobar massacre
Al-Qaeda is believed to have been responsible for the 2004 Khobar massacre, carried out on May 29, 2004.
July 7, 2005 London transport bombings
Main article: 7 July 2005 London bombings
Four members of Al-Qaeda, three of British Pakistani descent and one of British Jamaican descent attacked London's public transport on July 7, 2005. Three bombs were detonated on the London Underground and one on a double decker bus. The attacks took place between 8.50 am and 9.47 am. 56 people died during the attacks (including 4 terrorists) and around 700 were injured. The attack occurred the day after the city was selected to host the 2012 Summer Olympics.
June 2, 2008 Danish-embassy bombing
Al-Qaeda claimed responsibility for the bombing of the Danish embassy in Pakistan on June 2, 2008. A car bomb killed six people and injured several. Mustafa Abu al-Yazid, a high-ranking member of Al-Qaeda, issued a statement after the bombing, claiming that the attack was a response to the 2005 publication of the Muhammed Cartoons.
July 13, 2008 Battle of Wanat
The Battle of Wanat occurred on July 13, 2008, when forces including Al-Qaeda and Taliban guerrillas attacked NATO troops near the village of Wanat in the Waygal district in Afghanistan's far eastern province of Nuristan. The Battle of Wanat has been described as the "Black Hawk Down" of the War in Afghanistan, as one of the bloodiest attacks of the war and one of several attacks on remote outposts. In contrast to previous roadside bombs and haphazard attacks and ambushes, this attack was well coordinated with fighters from many insurgent and terrorist groups with an effort that was disciplined and sustained which was able to target key assets such as the TOW launcher with precision.
September 20, 2008 Islamabad Marriott Hotel bombing
Al-Qaeda is believed to have been responsible for the bombing of the Marriott Hotel in Pakistan on September 20, 2008. A truck bomb killed 54 people and injured 266 people.
Dec 30, 2009
An Al-Qaeda agent posing as a double agent killed 7 CIA officers in the Camp Chapman attack on December 30, 2009. The Jordanian man, thought to be an American asset penetrating Al-Qaeda was brought in the wire of the camp and detonated an explosive belt, killing 7 CIA, 1 Jordanian intelligence officer, and seriously wounding six others.