The jihadist group said it has taken the town of Gwoza in the north by force and that it intends to govern the whole of Nigeria under Islamic law.
We take a look at developments of the deadly virus as it continues to spread in West Africa. How did it start and how are countries dealing with it?
The worst outbreak of the virus to date and the efforts to contain it will impact African economies.
Many soldiers believe their officers are siphoning off funds and leaking intelligence to Boko Haram.
The virus has claimed its first victim in Nigeria, prompting officials to deploy health workers to all entry points and seek out suspected cases.
Parents of girls kidnapped by Boko Haram describe their anguish, 100 days on.
Nobel prizewinner hits out at 'Boko Haramism' of Nigerian culture and the banalisation of graft.
Citigroup expects more banks in Africa's largest economy to go to market in order to take advantage of lending opportunities.
Pakistan's Malala Yousafzai has held talks with some parents of the girls abducted in Nigeria and leaders of a group campaigning for their release.
The Nigerian military said it had killed 53 fighters from Boko Haram in northeasterly Borno state on Saturday.
At least 10 people were killed in raids by suspected Boko Haram gunmen on two villages near Chibok where more than 200 girls were abducted in April.
Twenty-one people have been killed and 27 injured after an explosion ripped through a centre showing a World Cup soccer match in north Nigeria.
President Jacob Zuma will give his State of the Nation address this week, while elsewhere investors will focus on eurozone inflation updates.
Boko Haram's acts are a timely wake-up call for a nation that has slept through countless horrors, writes Ben Okri.
Twenty women have been kidnapped by suspected Boko Haram gunmen in northeast Nigeria, near Chibok.
Nigerian President Goodluck Jonathan is talking tough, but attacks could result in hostages being killed.
An extraordinary Ecowas security summit has announced plans for a partnership with Central African states to fight "terrorism" in the region.
Muslims and Christians in the volatile Nigerian city have closed ranks in the wake of deadly attacks intended to inflame religious tensions.
Discussions between Nigeria's military chiefs and the president over how to rescue schoolgirls abducted by Boko Haram have reached a stalemate.