Mosque blast kills 4 in Nigeria

An explosion killed four people in the violence-torn city Nigerian city of Maiduguri as Muslim faithful left a mosque after Friday prayers, the military and residents said.
The group - which wants strict sharia law - has carried out scores of attacks, mainly in the north-east.
It has said it attacked several churches on Christmas Day, killing at least 42 people. Boko Haram has also in the past targeted international organisations and Muslim leaders from rival sects.
Earlier this week, Nigeria's main Christian group warned that the community may have to defend itself if the security forces could not protect it.