NEW : 26 people were injured in the mosque attack in Borno state , a medical source says . At least 44 people died when gunmen attacked the mosque , a police official says . The attackers are believed to have been Boko Haram militants who had taken over an army barracks and set it on fire after taking hostages inside. `` The UK stands with the government and people of Nigeria as they seek to reduce violence in the north east of the country . '' Boko Haram leader released a video over the weekend , boasted of the group 's strength .
NEW : 26 people were injured in the mosque attack in Borno state , a medical source says . At least 44 people died when gunmen attacked the mosque , a police official says . The attackers are believed to have been Boko Haram militants who had taken over an army barracks and set it on fire after taking hostages inside. Boko Haram leader released a video over the weekend , boasted of the group 's strength .