US officials say American presence in Yemen remains essential to intelligence gathering and counter-terrorism operations against al-Qaida, but stress evacuations would be ordered if a serious threat is seen - @NBCNews
al-Qaeda (/ælˈkaɪdə/ al-KY-də; Arabic: القاعدة al-qāʿidah, Arabic: [ælqɑːʕɪdɐ], translation: "The Base" and alternatively spelled al-Qaida and sometimes al-Qa'ida) is a global militant Islamist and Wahhabist organization founded by Osama bin Laden, Abdullah Azzam, and several other militants, at some point between August 1988 and late 1989, with origins traceable to the Soviet war in Afghanistan. It operates as a network comprising both a multinational, stateless army and a radical Wahhabi Muslim movement calling for global jihad and a strict interpretation of sharia law. It has been designated as a terrorist organization by the United Nations Security Council, NATO, the European Union, the United States, Russia, India and various other countries (see below). Al-Qaeda has carried out many attacks on targets it considers kafir. Amidst the Syrian civil war, al-Qaeda factions started fighting each other, as well as the Kurds and government.
al-Qaeda has attacked civilian and military targets in various countries, including the September 11 attacks, 1998 U.S. embassy bombings and the 2002 Bali bombings. The U.S. government responded to the September 11 attacks by launching the War on Terror. With the loss of key leaders, culminating in the death of Osama bin Laden, al-Qaeda's operations have devolved from actions that were controlled from the top down, to actions by franchise associated groups, to actions of lone wolf operators.
Characteristic techniques employed by al-Qaeda include suicide attacks and simultaneous bombings of different targets. Activities ascribed to it may involve members of the movement, who have taken a pledge of loyalty to Osama bin Laden, or the much more numerous "al-Qaeda-linked" individuals who have undergone training in one of its camps in Afghanistan, Pakistan, Iraq or Sudan, but who have not taken any pledge. al-Qaeda ideologues envision a complete break from all foreign influences in Muslim countries, and the creation of a new world-wide Islamic caliphate. Among the beliefs ascribed to al-Qaeda members is the conviction that a Christian–Jewish alliance is conspiring to destroy Islam. As Salafist jihadists, they believe that the killing of civilians is religiously sanctioned, and they ignore any aspect of religious scripture which might be interpreted as forbidding the murder of civilians and internecine fighting. Al-Qaeda also opposes man-made laws, and wants to replace them with a strict form of sharia law.
al-Qaeda is also responsible for instigating sectarian violence among Muslims. al-Qaeda is intolerant of non-Wahhabi/Salafi branches of Islam and denounces them by means of excommunications called "takfir." al-Qaeda leaders regard liberal Muslims, Shias, Sufis and other sects as heretics and have attacked their mosques and gatherings. Examples of sectarian attacks include the Yazidi community bombings, the Sadr City bombings, the Ashoura Massacre and the April 2007 Baghdad bombings. The group is led by the Egyptian theologian Ayman al-Zawahiri.