Up to 300 people may have been killed in fighting in the central Nigerian state of Plateau.
In a village south of the state capital, Jos, there were clashes between Muslim herders and Christian residents. It is thought that the herders attacked Dogo Nahawa, using machetes on people as they fled from their houses.
Acting President Goodluck Jonathan has put security forces on red alert to prevent the violence from spreading to neighbouring states.
This area has seen sectarian fighting before. In charge whilst President Umaru Yar’Adua recovers from a heart complaint, in January, Jonathan deployed troops after more than 300 people were killed.