The killing of Osama Bin Laden and other al-Qaeda leaders has led to new leaders emerging. The BBC profiles some of the most prominent names.
Ayman al-Zawahiri
Ayman al-Zawahiri, an eye surgeon who helped found the Egyptian militant group Islamic Jihad, was named as the new leader of al-Qaeda on 16 June 2011, a few weeks after Bin Laden's death.
In a statement, al-Qaeda vowed to continue its jihad under the new leadership against "crusader America and its servant Israel, and whoever supports them".
Zawahiri was already the group's chief ideologue and was believed by some experts to have been the "operational brains" behind the 11 September 2001 attacks in the US.
Zawahiri was number two - behind only Bin Laden - in the 22 "most wanted terrorists" list announced by the US government in 2001 and continues to have a $25m (£15m) bounty on his head.
He was reportedly last seen in the eastern Afghan town of Khost in October 2001, and went into hiding after a US-led coalition overthrew the Taliban.
He was thought to be hiding in the mountainous regions along the Afghanistan-Pakistan border with the help of sympathetic local tribes.
However, the killing of Bin Laden on 1 May 2011 in Abbottabad, north of the Pakistani capital Islamabad, suggests this may not be the case.
His wife and children were reportedly killed in a US air strike in late 2001.
Zawahiri was for a time al-Qaeda's most prominent spokesman, appearing in 40 videos and audiotapes since 2003 - most recently in April 2011 - as the group tried to radicalise and recruit Muslims worldwide.
He has also been indicted in the US for his role in the 1998 US embassy bombings in Africa, and was sentenced to death in Egypt in absentia for his activities with Islamic Jihad during the 1990s.
Abu Yahya al-Libi
Abu Yahya al-Libi is believed by US officials to have been killed in drone strike on Pakistan's tribal north-west on Monday 4 June 2012. But his death has not been confirmed by sources in Pakistan.
Also known as Hasan Qayid and Yunis al-Sahrawi, Libi is thought to have been a member of the Libyan Islamic Fighting Group (LIFG) before he allied himself to Osama Bin Laden.
He then emerged as al-Qaeda's leading theologian, and later its most visible face on video, surpassing Ayman al-Zawahri in recent years.
Libi is believed to have spent five years as a religious student in Mauritania in the 1990s.
He claimed to have been captured by Pakistani forces in 2002 and then sent to the US military airbase at Bagram in Afghanistan, from where he escaped in July 2005 along with three other al-Qaeda members.
Al-Qaeda named Libi as a field commander in Afghanistan, though he subsequently styled himself in his many videos as a theological scholar, and spoke on a variety of global issues of importance to the group.
Khalid al-Habib
Khalid al-Habib, thought to be either Egyptian or Moroccan, was identified in a November 2005 video as al-Qaeda's field commander in south-east Afghanistan, while Abd al-Hadi al-Iraqi was named as its commander in the south-west.
Habib seems to have assumed overall command after the latter's capture in 2006.
He was described as al-Qaeda's "military commander" in July 2008.
US military officials say he oversees al-Qaeda's "internal" operations in Afghanistan and northern Pakistan.
Habib may be operating under an assumed identity, according to some analysts. One of his noms de guerre is believed to be Khalid al-Harbi.
Adnan el Shukrijumah
In August 2010, the FBI said Adnan Gulshair el Shukrijumah had taken over as chief of al-Qaeda's "external operations council". Having lived for more than 15 years in the US, he is the first leader intimately familiar with American society to have been placed in charge of planning attacks for the group outside Afghanistan.
Such a position - once held by the alleged mastermind of 9/11, Khalid Sheikh Mohammed - necessitates regular contact with al-Qaeda's senior leadership and military commanders, and makes him likely to be killed or captured.
Born in Saudi Arabia, Shukrijumah moved to the US when his father, a Muslim cleric, took up a post at a mosque in Brooklyn. They later moved to Florida.
In the late 1990s, he became convinced that he had to participate in jihad in place like Chechnya, and left for training camps in Afghanistan.
Shukrijumah has been named in a US federal indictment as a conspirator in the case against three men accused of plotting suicide bomb attacks on New York's subway system in 2009. He is also suspected of having played a role in plotting al-Qaeda attacks in Panama, Norway and the UK.
Saif al-Adel
An Egyptian in his late 40s or early 50s, Saif al-Adel is the nom de guerre of a former Egyptian army colonel, Muhamad Ibrahim Makkawi. He travelled to Afghanistan in the 1980s to fight Soviet forces with the mujahideen. Adel was once Osama Bin Laden's security chief, and assumed many of military commander Mohammed Atef's duties after his death in a US air strike in November 2001.
He is suspected of involvement in the 1998 US embassy bombings in East Africa, training the Somali fighters who killed 18 US servicemen in Mogadishu in 1993, and instructing some of the 11 September 2001 hijackers.
In 1987, Egypt accused Adel of trying to establish a military wing of the militant Islamic group al-Jihad, and of trying to overthrow the government.
Following the invasion of Afghanistan in 2001, Adel is believed to have fled to Iran with Suleiman Abu Ghaith and Saad Bin Laden, a son of the late al-Qaeda leader. They were allegedly then held under house arrest by the Iran's Islamic Revolutionary Guard Corps (IRGC). Iran never acknowledged their presence.
Abu Ghaith was arrested in Jordan and extradited to the US in March 2013.
Several letters and internet statements bearing Adel's name or aliases have been released since 2002, leading analysts to believe he is still in contact with al-Qaeda's leaders in the region.
Recent reports say Adel may have been released and made his way to northern Pakistan, along with Saad Bin Laden.
Mustafa Hamid
Mustafa Hamid, the father-in-law of Saif al-Adel, served as instructor in tactics at an al-Qaeda camp near Jalalabad and is the link between the group and Iran's government, according to the US.
After the fall of the Taliban, he is said to have negotiated the safe relocation of several senior al-Qaeda members and their families to Iran. In mid-2003, Hamid was arrested by the Iranian authorities.
Saad Bin Laden
Saad Bin Laden, one of Osama Bin Laden's sons, has been involved in al-Qaeda activities. In late 2001, he helped his relatives flee to Iran.
He made key decisions for al-Qaeda and was part of a small group of al-Qaeda members involved in managing the organisation from Iran, according to US officials. He was arrested by Iranian authorities in early 2003, but recent reports say he may have been released and made his way to northern Pakistan.
US officials said an "adult son" of Osama Bin Laden's was killed alongside him in the raid in Abbottabad in May 2011. It is not known if it was Saad.
Hamza al-Jawfi
Hamza al-Jawfi, a Gulf Arab, is believed by some to have become al-Qaeda's external operations chief after the death of Abu Ubaida al-Masri from hepatitis C in December 2007. However, the FBI has said this year that Adnan el Shukrijumah had assumed this role.
Matiur Rehman
Matiur Rehman is a Pakistani militant who has been identified as al-Qaeda's planning chief. He is said to have been an architect of the foiled "liquid bomb" plot to explode passenger aircraft over the Atlantic in 2006.
Abu Khalil al-Madani
Little is known about Abu Khalil al-Madani, who was identified as a member of al-Qaeda's Shura council in a July 2008 video. His name suggests he is Saudi.
Midhat Mursi
An Egyptian chemist, Midhat Mursi al-Sayid Omar has allegedly overseen al-Qaeda's efforts to develop chemical and biological weapons. Also known as Abu Khabab, he left Egypt to fight the Soviets in the 1980s. A fellow mujahideen says he was slow to join al-Qaeda because he disagreed with the group's central strategy and was not an ally of Ayman al-Zawahiri, but changed his mind in part because he needed the money.
Mursi was a trainer at al-Qaeda's Derunta camp in Afghanistan when it was set up in the late 1990s.
In addition to teaching courses on conventional explosives, he wrote manuals on how to make toxic weapons and conducted a variety of experiments as part of Project al-Zabadi, or "curdled milk".
The US believes he may be living in Pakistan, although other reports suggest he escaped to the Pankisi Gorge in the Caucasus region in 2001. US intelligence officials do not believe he occupies a senior leadership position.
Adam Gadahn
Adam Gadahn, a US citizen who grew up in California, has emerged as a high-profile propagandist for al-Qaeda, appearing in a string of videos.
After converting to Islam as a teenager, he moved in 1998 to Pakistan and married an Afghan refugee. Gadahn performed translations for al-Qaeda and become associated with al-Qaeda's captured field commander, Abu Zubaydah. He is also thought to have later trained at a militant camp in Afghanistan.
In 2004, the US justice department named him as one of seven al-Qaeda operatives planning imminent attacks on the US. Shortly afterwards, he appeared in a video on behalf of al-Qaeda, identifying himself as "Azzam the American".
In September 2006, he appeared in a video with Ayman al-Zawahiri and exhorted his fellow Americans to convert to Islam and support al-Qaeda.
The next month, Gadahn became the first US citizen to be charged with treason since World War II. The indictment said he had "knowingly adhered to an enemy of the United States... with intent to betray the United States". A $1m bounty was placed on his head.
Analysts say Gadahn is not part of al-Qaeda's senior leadership, and does not hold any operational or ideological significance.
Nasser Abdul Karim al-Wuhayshi
Wuhayshi, a former aide to Osama Bin Laden, is the leader of al-Qaeda in the Arabian Peninsula (AQAP), which was formed in 2009 in a merger between two offshoots of al-Qaeda in Saudi Arabia and Yemen.
US counter-terrorism officials have said it is the "most active operation franchise" of al-Qaeda beyond Pakistan and Afghanistan.
Wuhayshi, who is from the southern Yemeni governorate of al-Baida, spent time in religious institutions before travelling to Afghanistan in the late 1990s.
He fought at the battle of Tora Bora in December 2001, before escaping over the border into Iran, where he was eventually arrested. He was extradited to Yemen in 2003.
In February 2006, Wuhayshi and 22 other suspected al-Qaeda members managed to escape from a prison in Sanaa. Among them were also Jamal al-Badawi, the alleged mastermind of the USS Cole bombing, and Qasim al-Raymi, al-Qaeda's in the Arabian Peninsula's military commander.
After their escape from prison, Wuhayshi and Raymi are said to have overseen the formation of al-Qaeda in Yemen, which took in both new recruits and Arab fighters returning from Iraq and Afghanistan.
The group claimed responsibility for two suicide bomb attacks that killed six Western tourists before being linked to the assault on the US embassy in Sanaa in 2008, in which 10 Yemeni guards and four civilians died.
Four months later, Wuhayshi announced in a video the merger of the al-Qaeda offshoots in Yemen and Saudi Arabia to form "al-Qaeda of Jihad Organisation in the Arabian Peninsula".
The group's first operation outside Yemen was carried out in Saudi Arabia in August 2009 against the kingdom's security chief, Prince Mohammed bin Nayef, though he survived.
It later said it was behind the attempt to blow up a US passenger jet as it flew into Detroit on 25 December 2009. A Nigerian man charged in relation with the incident said AQAP operatives had trained him.
On 10 September 2012, officials in Yemen said Wuhayshi's deputy, Saudi-born Said al-Shihri, had been killed in an air strike in Hadramawt in southern Yemen.
Abou Mossab Abdelwadoud
A former university science student and infamous bomb-maker, Abdelwadoud is the leader of al-Qaeda in the Islamic Maghreb (AQIM).
He became leader of the head of the Algerian Islamist militant organisation, the Salafist Group for Preaching and Combat (GSPC), in mid-2004, succeeding Nabil Sahraoui after he was killed in a major army operation.
After university in 1995, Abdelwadoud joined the Armed Islamist Group (GIA), a precursor to the GSPC which shared its aim of establishing an Islamic state in Algeria. He is said to have become a member of the GSPC in 1998.
Abdelwadoud, whose real name is Abdelmalek Droukdel, was one of the signatories to a statement in 2003 announcing an alliance with al-Qaeda.
In September 2006, the GSPC said it had joined forces with al-Qaeda, and in January 2007 it announced it had changed its name to "al-Qaeda in the Land of the Islamic Maghreb" to reflect its allegiance. Abdelwadoud said he had consulted Ayman al-Zawahiri about the group's plans.
Three months later, 33 people were killed in bomb attacks on official buildings in Algiers. Abdelwadoud allegedly supervised the operation. That December, twin car bombs killed at least 37 people in the capital.
The ambitions of the group's leadership widened, and it subsequently carried out a number of attacks across North Africa. It also declared its intention to attack Western targets and send jihadis to Iraq. Westerners have also been kidnapped and held for ransom; some have been killed.
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