On 5 December 2013, a coordinated terrorist attack occurred targeting the Ministry of Defense complex in Sanaa, Yemen. Heavily armed militants utilized a car bomb to breach the gates of the complex before storming it and occupying a hospital within it. The attack, which killed 52 people and injured 167, was claimed by Ansar al-Sharia, an affiliate of al-Qaeda in the Arabian Peninsula (AQAP). AQAP later issued an apology for the attack after footage from within the hospital was broadcast showing the gunmen murdering medical personnel.
AQAP and its local affiliate Ansar al-Sharia gained significant strength amid the Yemeni revolution in 2011, which allowed them to seize territory in southern Yemen while the central government was preoccupied. Despite this, terrorist attacks were still rare in Sanaa due to heavy security and AQAP's preoccupation with battling Yemeni forces in the southern governorates. After the government launched a military offensive against them in 2012 and the United States intensified their drone campaign, AQAP began launching several attacks against government and security targets in the capital such as with the Unity Day parade rehearsal bombing in May 2012, a suicide bombing at a police academy in July and a car bombing which attempted to assassinate Defense Minister Mohammed Nasser Ahmed in September. Despite losing their territory in the south, the group continued waging large attacks, such as in September 2013 when AQAP fighters attacked two military installations in southern Yemen, killing 21 soldiers. In November 2013, two AQAP gunmen on a motorcycle killed a Belarusian defence contractor. The Yemeni government introduced a new security plan for Sanaa on 2 December in response to the shooting, which included provisions such as banning motorcycles within the central part of the capital.
Located within the edge of the Bab al-Yemen neighbourhood, the Yemeni Ministry of Defense complex, which houses the presidential office, minister of defense and military chief of staff, is regarded as one of the most important and secure facilities in the country. Within the complex contains the al-Oradi hospital which is used by military and civil state senior officials and hosts foreign workers. A month prior to the attack, two army vehicles had reportedly disappeared according to military officials. The security chief at the defense ministry compound was replaced two weeks prior to the attack. One week prior, the defense ministry was warned that a major attack in Sanaa was imminent, leading to authorities allocating additional security forces at the compound. The Yemeni defense minister, who had previously been the subject of multiple assassination attempts by AQAP, was meeting with the U.S. government in Washington, D.C. on the day of the attack. At the time the attack began, a planned meeting of top military commanders was set to take place, though it was unexpectedly delayed at the last minute.
AQAP gunmen dressed in army uniforms opened fire on the guards outside of the eastern gate of the defense ministry complex, killing four guards and three militants. After killing the guards, an AQAP suicide bomber rammed a pickup truck loaded with 500 kg of explosives through the western gate into the complex at around 9:00 a.m. AST (UTC+03:00). The suicide bomber reportedly failed to reach his target inside the complex due to gunfire from Yemeni forces, instead blowing up near the entrance of the al-Oradi hospital. The explosion blew out the windows and doors of nearby homes and offices in the complex and destroyed an armored military vehicle along with three other cars. Witnesses described the initial blast violently shaking the ground near the complex and in the Bab al-Yemen district, with large plumes of smoke soon rising from the building.
Minutes after the bombing, a second vehicle containing 12 AQAP gunmen in military uniforms armed with assault rifles, hand grenades and rocket-propelled grenades drove through the gate and opened fired on the soldiers present. Yemeni forces besieged the militants near the gate entrance before they could reach the defense ministry building in the complex. The militants split into two groups; one storming a laboratory and the other occupying the hospital, close by to the gate from which they entered. Within the hospital, the gunmen indiscriminately killed soldiers, doctors, nurses, and patients. According to witnesses, one of the militants "pulled a Western doctor and a Filipino nurse into the hospital's courtyard and shot them in front of local staff." CCTV footage showed several scenes from the attack, including a militant calmly walking towards a huddling group of doctors and nurses before throwing a grenade at them, as well as a militant shooting unarmed surgeons at point-blank range. Some Filipino workers in the hospital reportedly survived the attack by playing dead.
Yemeni soldiers and police officers engaged in an hours long firefight with the militants after they breached the compound. Three militants were killed within the hospital after Yemeni forces raided and secured it. Another two were killed after escaping from the hospital into a mosque in the complex. Security forces launched a manhunt in Sanaa to find the perpetrators of the attack, killing five militants and losing one Yemeni commando. All of the militants were killed by 4:30 p.m. AST according to the investigative committee for the attack. Despite this, several sources said that the fighting continued throughout the rest of the day into 6 December.
The attack killed 52 people and injured 167, of which nine were wounded seriously. Victims of the attack included 31 army officers, including three colonels, civilians as well as medical personnel working at the hospital, where most of the casualties occurred. Officials said that seven foreign workers were killed within the hospital, them being two German aid workers for development agency Deutsche Gesellschaft für Internationale Zusammenarbeit (GIZ), two doctors from Vietnam, two nurses from the Philippines and a nurse from India. The Filipino government stated that seven Filipinos including a doctor had been killed and 10 more were injured. Among the Yemenis killed in the hospital attack included three doctors, five patients, including senior Yemeni judge Abduljaleel Noman and his wife, a local GIZ worker and a relative of President Abdrabbuh Mansur Hadi.
In a message posted on 6 December by the al-Malahem Media account on Twitter, AQAP affiliate Ansar al-Sharia claimed responsibility for conducting the attack. The group said that they targeted the Ministry of Defense due to the presence of "rooms for controlling unmanned drones and a number of American experts." It stated that the "mujahideen have heavily struck one of these rooms in Defense Ministry headquarters" as it believed the site to be a “legitimate target” due to being used by Americans against "this Muslim nation."
After the attack, Yemeni state-television broadcast CCTV footage from within the hospital showcasing the events. Advisor to President Hadi Fares Al-Saqqaf said the footage was intended to show that the attack targeted a civilian facility as opposed to a military one, swaying public opinion against AQAP. The release of the footage lead to public outrage among Yemenis and even AQAP supporters, prompting the group initially deny it as fake in social media posts on the internet. According Yemen Post editor-in-chief Hakim Almasmari, the broadcast of the attack "did a great deal of damage to the group's image among ordinary Yemenis who may have been ambivalent about the group's goals."
On 21 December, AQAP released a video in which senior leader Qasim al-Raymi apologized for the attack on the hospital. Raymi said that the group ordered the militants not to attack the hospital or mosque in the complex but one gunman had done so anyways. He offered apologies and condolences to the families of the victims and said that the group would agree to pay blood money to those killed in the hospital. However, Raymi stated that AQAP is “continuing with our jihad” and reiterated the groups claim that the Ministry of Defense was housing drone control rooms and American experts, defending it as a legitimate target. He warned that the group would attack other military posts which "cooperate with the American drones by spying, planting chips, providing information or offering intelligence advice".