(http://news.bbcimg.co.uk/media/images/78663000/png/_78663896_nigeria_gombe_464_31102014.png) It also controls Michika, a trading centre in Adamawa state not far from the Cameroon border, prompting fears that it may be looking for further extend its reach.
Thousands of people who have fled towns and villages captured by Boko Haram have taken refuge in neighbouring towns.
In April, the militants captured more than 200 girls from a boarding school in the town of Chibok, in Borno state.
Countries such as China, France, the UK and US have sent military assistance to help find the girls but they have not yet been rescued.
Source: BBC