Officials in Nigeria say 16 people have been killed in a violent protest against cartoons seen as demeaning the Prophet Muhammad.
Police say a demonstration in the northeastern state of Borno turned into a riot Saturday when Muslim protesters attacked Christians and burned churches.
A Nigerian police spokesman Haz Iwendi said the army was assisting police efforts to restore order and a curfew had been imposed. Nigeria is about 50 percent Muslim and 40 percent Christian.
Meanwhile, the Pakistani government has imposed a ban on protests in the capital, Islamabad, ahead of planned demonstrations on Sunday. The ban follows a violent week of demonstrations in Pakistan that killed five people.
The cartoons were originally published in September by a Danish newspaper. They have triggered widespread and occasionally violent demonstrations around the world.