(http://news.bbcimg.co.uk/media/images/80034000/jpg/_80034883_nigeriamalarigumsuri4640105.jpg) Last month suspected Boko Haram militants stormed another village, Gumsuri. A survivor told the BBC that 33 villagers had been killed and about 200 people kidnapped.
Militants attacks have increased since three Nigerian states - Borno, Adamawa and Yobe - were put under emergency rule more than 18 months ago.
The kidnapping of more than 200 schoolgirls from the town of Chibok in April sparked international outrage.
Despite military assistance from countries such as China, France, the UK and the US, the girls have not yet been rescued.
(http://news.bbcimg.co.uk/media/images/75306000/jpg/_75306515_line976.jpg) Who are Boko Haram? (http://news.bbcimg.co.uk/media/images/79810000/jpg/_79810992_84f6ab18-69cf-4785-ab82-93d433881bdb.jpg) More than 200 schoolgirls were kidnapped by the group in April
- Founded in 2002
- Initially focused on opposing Western education - Boko Haram means "Western education is forbidden" in the Hausa language
- Launched military operations in 2009 to create an Islamic state
- Thousands killed, mostly in north-eastern Nigeria - also attacked police and UN headquarters in the capital, Abuja
- Some three million people are affected
- Declared a terrorist group by the US in 2013
Who are Boko Haram? (http://m.bbc.co.uk/news/world-africa-13809501)
Profile: Boko Haram leader Abubakar Shekau (http://m.bbc.co.uk/news/world-africa-18020349)
(http://news.bbcimg.co.uk/media/images/75306000/jpg/_75306515_line976.jpg)
Source: BBC