(http://news.bbcimg.co.uk/media/images/75329000/jpg/_75329063_nigeriamaidugurigwozamandara4640614.jpg) On 1 June at least 14 people were killed in a bomb attack on a bar in Adamawa that was screening a televised football match. No group claimed responsibility for the blast.
In March, many people were also killed in explosions while watching football in a video hall in Borno's Maiduguri town. On both occasions, Boko Haram were blamed for the blasts.
Boko Haram - which means "Western education is forbidden" in the Hausa language - wants to overthrow the government and create an Islamic state.
The group captured international attention in April after it abducted more than 200 girls in Chibok in Borno state.
It is also suspected of killing at least 29 students in an attack on a boarding school in Yobe in February.
Source: BBC.co.uk