At least 121 people have been killed and hundreds more injured in different parts of northern Nigeria following the presidential election, the Abuja based Leadership newspaper reported.

About 15,000 people have been displaced, many of them seeking shelter in police stations and army barracks, the report said.

The National Emergency Management Agency (NEMA) told Xinhua on Thursday that it is working with response agencies toward addressing the plight of victims.

Spokesperson for the agency Shuaib Yushau said huge human casualty and loss of properties were noted after the presidential elections. "It is to difficult to give a specific casualty number now," he told Xinhua.

According to him, the agency's truck with relief materials are being despatched to victims of the recent crisis in northern Kano, Kaduna, Bauchi and Gombe states. He told Xinhua that approval has been giving for free medical service in government hospitals to innocent victims.

Violence has spread in northern Nigeria as youths protest the results of Saturday's presidential election being released state- by-state.

Already, a dusk-to-dawn curfew has been imposed in northern Kano, Kaduna, Katsina, Gombe, Bauchi and Zamfara states.

The riots also spread to Abuja, Lafia and Taraba all in the north central, and Yola in the northeast.

The residence of Namadi Sambo, the country's vice president, in Kaduna was torched in the riots.

Churches and other public buildings were also burnt in the Barnawa area of Kaduna, where the main opposition party, the Congress for Progressive Change (CPC), won, beating Sambo's Peoples Democratic Party (PDP).

Local and international observers adjudged the election free and fair and results indicated that President Goodluck Jonathan is having a landslide victory.