The 2015 Baga massacre was a series of mass killings carried out by the Boko Haram terrorist group in the north-eastern Nigerian town of Baga and its environs, in the state of Borno, between 3 January and 7 January 2015.

The attack began on 3 January when Boko Haram overran a military base that was the headquarters of the Multinational Joint Task Force containing troops from Chad, Niger, and Nigeria. The militants then forced thousands of locals from the region and committed mass killings that culminated on the 7th.

Fatalities have been reported to be "heavy" but their extent is unclear. Western media outlets reported that "over 2,000" people are thought to have been killed or "unaccounted for", but local media reported "at least a hundred" fatalities, while the Nigerian Ministry of Defence said that no more than 150 people in total had been killed, including militants. Several government officials denied that the fatalities were as extensive as reported, with some even claiming that the massacre had never taken place or that the Nigerian military had repelled the militants from the region, a claim that was refuted by local officials, survivors, and the international media.Baga and at least 16 other towns are thought to have been destroyed as over 35,000 people are reported to have been displaced, with many feared to have drowned while trying to cross Lake Chad and others trapped on islands in the lake. The attacks are said to have resulted in Boko Haram extending its control to over 70% of Borno State, while its leader, Abubakar Shekau, claimed responsibility for the massacre in a video statement, saying that they "were not much" and that the group's insurgency "would not stop".



Boko Haram, officially known as Jamā'at Ahl as-Sunnah lid-Da'wah wa'l-Jihād (Arabic: جماعة أهل السنة للدعوة والجهاد, lit. 'Group of the People of Sunnah for Preaching and Jihad'), is a terrorist organization based in northeastern Nigeria, which is also active in Chad, Niger and northern Cameroon. In 2016, the group split, resulting in the emergence of a hostile faction known as the Islamic State's West Africa Province.

Founded by Mohammed Yusuf in 2002, the group was led by Abubakar Shekau from 2009 until his death in 2021, although it splintered into other groups after Yusuf's death and also in 2015. When the group was first formed, their main goal was to "purify" Islam in northern Nigeria, believing jihad should be delayed until the group was strong enough to overthrow the Nigerian government. The group formerly aligned itself with the Islamic State of Iraq and the Levant. The group has been known for its brutality, and since the insurgency started in 2009, Boko Haram has killed tens of thousands of people, in frequent attacks against the police, armed forces and civilians. It has resulted in the deaths of more than 300,000 children and displaced 2.3 million from their homes and was during part of the mid 2010s the world's deadliest terror group according to the Global Terrorism Index. Boko Haram has contributed to regional food crises and famines.After its founding in 2002, Boko Haram's increasing radicalisation led to the suppression operation by the Nigerian military and the killing of its leader Mohammed Yusuf in July 2009. Its unexpected resurgence, following a mass prison break in September 2010 in Bauchi, was accompanied by increasingly sophisticated attacks, initially against soft targets, but progressing in 2011 to include suicide bombings of police buildings and the United Nations office in Abuja. The government's establishment of a state of emergency at the beginning of 2012, extended in the following year to cover the entire northeast of Nigeria, led to an increase in both security force abuses and militant attacks.Of the 2.3 million people displaced by the conflict since May 2013, at least 250,000 left Nigeria and fled to Cameroon, Chad or Niger. Boko Haram killed over 6,600 people in 2014. The group has carried out mass abductions including the kidnapping of 276 schoolgirls in Chibok, Borno State, Nigeria, in April 2014. Corruption in the security services and human rights abuses committed by them have hampered efforts to counter the unrest.In mid-2014, the militants gained control of swaths of territory in and around their home state of Borno, estimated at 50,000 square kilometres (20,000 sq mi) in January 2015, but did not capture the state capital, Maiduguri, where the group was originally based. On 7 March 2015, Boko Haram's leader Abubakar Shekau pledged allegiance to the Islamic State of Iraq and the Levant. According to the BBC, due to internal disputes between the two groups, hundreds of terrorists left Boko Haram and formed their own organization, named "Islamic State's West Africa Province". In September 2015, the Director of Information at the Defence Headquarters of Nigeria announced that all Boko Haram camps had been destroyed but attacks from the group continue. In 2019, president of Nigeria, Muhammadu Buhari claimed that Boko Haram was "technically defeated". However, attacks by Boko Haram have escalated and it still poses a major threat as of 2021. In May 2021, Nigerian officials and a separate investigation conducted by The Wall Street Journal backed recent claims that Shekau was dead.