Nigeria sectarian violence unfortunate, says president

Hundreds of people have been fleeing areas of north-eastern Nigeria, after a wave of violence apparently targeting Christian communities.

At least 29 people have died in four attacks in Adamawa state in recent days, prompting the state governor to impose a curfew.

The militant Islamist Boko Haram group has said it carried out several attacks.

Addressing the nation, President Goodluck Jonathan said "recent acts of violence are unfortunate... our security forces will enforce the law without fear or favour".