The Nigerian air force has deployed fighter jets to try to prevent the spread of violence after gunmen killed dozen of people in remote villages in central Nigeria.
More than 30 people were killed earlier this week in several villages in the Bassa area of Plateau state.
Most of those killed were sheltering in a primary school at the time of the attack.
Some have accused herdsmen of carrying out the attacks and believe them to be retaliation for the earlier killing of six herdsmen.
The Nigerian President Muhammadu Buhari has described the killings as madness and directed the armed forces to act swiftly.
Nigeria’s Chief of Air Staff told the BBC that the deployment of the fighter jets and helicopters is to support ground troops and track the movement of gunmen who may be hiding in the mountainous area.
Plateau state is a scene of frequent deadly ethnic and religious violence as well as clashes between farmers and herders in the past – in which thousands of people have been killed.