Boko Haram

Boko Haram at a glance:

• Founded in 2002
• Official Arabic name, Jama'atu Ahlis Sunna Lidda'awati wal-Jihad, means "People Committed to the Propagation of the Prophet's Teachings and Jihad"
• Initially focused on opposing Western education
• Launched military operations in 2009 to create Islamic state
• Designated a terrorist group by US in 2013
• Declared a caliphate in areas it controls in 2014

Since the Sokoto caliphate, which ruled parts of what is now northern Nigeria, Niger and southern Cameroon, fell under British control in 1903, there has been resistance among some of the area's Muslims to Western education.

They still refuse to send their children to government-run "Western schools", a problem compounded by the ruling elite which does not see education as a priority. Against this background, the charismatic Muslim cleric, Mohammed Yusuf, formed Boko Haram in Maiduguri in 2002. He set up a religious complex, which included a mosque and an Islamic school. Many poor Muslim families from across Nigeria, as well as neighbouring countries, enrolled their children at the school. But Boko Haram was not only interested in education. Its political goal was to create an Islamic state, and the school became a recruiting ground for jihadis. In 2009, Boko Haram carried out a spate of attacks on police stations and other government buildings in Maiduguri. This led to shoot-outs on Maiduguri's streets. Hundreds of Boko Haram supporters were killed and thousands of residents fled the city. Nigeria's security forces eventually seized the group's headquarters, capturing its fighters and killing Mr Yusuf. His body was shown on state television and the security forces declared Boko Haram finished.

But its fighters regrouped under a new leader, Abubakar Shekau, and have stepped up their insurgency. In 2013, the US designated it a terrorist organisation, amid fears that it had developed links with other militant groups, such as al-Qaeda in the Islamic Maghreb, to wage a global jihad. Boko Haram's trademark was originally the use of gunmen on motorbikes, killing police, politicians and anyone who criticises it, including clerics from other Muslim traditions and Christian preachers.

The group has also staged more audacious attacks in northern and central Nigeria, including bombing churches, bus ranks, bars, military barracks and even the police and UN headquarters in the capital, Abuja. Amid growing concern about the escalating violence, President Goodluck Jonathan declared a state of emergency in May 2013 in the three northern states where Boko Haram is the strongest - Borno, Yobe and Adamawa.

Reason: 

Despite its vast resources, Nigeria ranks among the most unequal countries in the world, according to the UN. The poverty in the north is in stark contrast to the more developed southern states. While in the oil-rich south-east, the residents of Delta and Akwa Ibom complain that all the wealth they generate flows up the pipeline to Abuja and Lagos.

Southern residents tend to have better access to healthcare, as reflected by the greater uptake of vaccines for polio, tuberculosis, tetanus and diphtheria. Some northern groups have in the past boycotted immunisation programmes, saying they are a Western plot to make Muslim women infertile. This led to a recurrence of polio, but the vaccinations have now resumed.

Female literacy is seen as the key to raising living standards for the next generation. For example, a newborn child is far likelier to survive if its mother is well-educated. In Nigeria we see a stark contrast between the mainly Muslim north and the Christian and animist south. In some northern states less than 5% of women can read and write, whereas in some Igbo areas more than 90% are literate.

Nigeria is Africa's biggest oil producer and among the biggest in the world but most of its people subsist on less than $2 a day. The oil is produced in the south-east and some militant groups there want to keep a greater share of the wealth which comes from under their feet. Attacks by militants on oil installations led to a sharp fall in Nigeria's output during the last decade. But in 2010, a government amnesty led thousands of fighters to lay down their weapons.