(http://news.bbcimg.co.uk/media/images/81210000/png/_81210649_nigeria_kano_potiskum464.png) On Sunday, a young girl with explosives strapped to her killed five people and wounded dozens at a security checkpoint outside a market in Potiskum.
Boko Haram now controls vast swathes of north-east Nigeria and has displaced more than three million people.
The mounting threat of the Islamist insurgency has already led to the postponement of February's presidential elections, with the vote now due to take place on 28 March.
The delay is designed to give the Nigerian military time to re-establish its presence in the north-east.
However, opponents of President Jonathan have claimed that the delay is actually a political tactic.
The group is under increased pressure from the Nigerian troops as well as those of Chad, Niger, and Cameroon.
Source: BBC