Abuja: More than 500 were killed in the unrest that erupted in northern part of Nigeria after the victory of President Goodluck Jonathan in presidential polls that was held on April 16.

On the trickling results of the polls, youths claiming to be supporters of former military dictator General Muhammadu Buhari took to the streets burning churches, mosques, houses and killing persons suspected to belong to Jonathan's ruling People’s Democratic Party (PDP).

Riots broke out in the north after Jonathan was declared winner on Monday, in a landmark polling that led to regional tensions. Jonathan is a Christian from the south while Buhari is a Muslim from the north.

The President of Civil Rights Congress (CRC) Shehu Sani said, "The number was gathered in the towns of Zonkwa, Kafanchan and Zangon Kataf,"
adding that the number could be much higher.

The election was seen by local and foreign observers as a big improvement considering and comparing the rate of ballot stuffing, rigging and poll day violence witnessed during the presidential elections of 2007.

Governorship and state assembly elections are to be held on Tuesday and the Nigerian government is reviewing internal security ahead of the polls, following the intelligence report about plans by some people to disrupt the process.

In the riot many people were killed while several others wounded in the rioting which affected the states of Kaduna, Bauchi, Yobe, Niger, Borno, Jigawa, and Nasarawa. An estimated 25,000 have been displaced and some 375 wounded, according to the Red Cross.