Abuja: To prevent the recurrence of deadly riots, security has been beefed up in Nigeria ahead of governorship elections scheduled for Tuesday.

Authorities have stepped up security to prevent riots that led to death of hundreds after the presidential polls held last Saturday.

"We cannot afford not to effectively monitor political activities and place actors under surveillance in order to checkmate some of them who are criminally minded and have resorted to the use of force to foment trouble and cause mayhem with their do or die attitude," Ade Abolurin, the head of the country’s National Security and Civil Defence Corps said.

More than 200 people were killed after protestors agitated against the victory of President Goodluck Jonathan, according to a civil society group. They burnt churches, mosques and left hundreds injured and thousand displaced.

Jonathan is a Christian from the south while his rival former military dictator General Muhammadu Buhari is a Muslim from the north. He secured 59 percent of the vote and easily beat Buhari, who had only 32 percent.

"There is strategic deployment of personnel across the states of the federation, is to curtail further violence and crime in the process of attaining a free, fair, and credible election" Abolurin said.

In the southern state of Lagos considered as the country’s economic capital, police checkpoints have increased with eagle eyed officers waving down vehicles and scrutinising pedestrians.

Land borders have also been closed to stop influx of foreigners who may be used to rig the election.

An estimated 25,000 have been displaced and some 375 wounded, according to the Red Cross.

Anti-riot policemen and the military were deployed in the streets following rioting.