Soldiers have taken control of Kano state in northern Nigeria after election-related violence over the weekend killed at least six people.
Troops are patrolling key positions and have set up roadblocks. The army has urged people to remain calm and asked parents to control their children.
An army spokesman said 280 soldiers had been deployed with 220 held in reserve.
Violence broke out when the state opposition accused the governing party of rigging state polls.
Kano is one of the few states that is controlled by the national opposition, while Nigeria's ruling PDP is in opposition locally.
Voters in Kano cast ballots on Saturday for local constituency leaders. By Sunday PDP supporters had set up barricades and lit fires, destroying state property and burning down local government buildings.
Police say they arrested many people and recovered weapons including guns and machetes.
The army spokesman said it was helping the police to restore law and order.
The BBC's Alex Last in Lagos says although these were only local elections, political office in Nigeria means the prospect of considerable money and power, so political violence is never far away.