Security has been stepped up in Nigeria ahead of the presidential elections.<br /><br /> Originally scheduled for February 14, the vote was postponed to March 28 due to the ongoing threat of violence from hardline militant group Boko Haram. <br /><br /> With this in mind, President Goodluck Johnathan and opposition leader Muhammadu Buhari have signed a second accord pledging to hold peaceful polls.<br /><br /> In the latest pact, the pair agree not to incite religious or ethnic tensions and call on all Nigerian citizens to refrain from violence.<br /><br /> Post-election violence in 2011 resulted in the deaths of around 800 people.<br /><br /> Recent weeks have seen Boko Haram carry out a number of suicide bombings in Nigeria, despite a military crackdown.<br /><br /> In an attempt to guarantee people’s safety the country’s land and sea borders have been closed in the days running up to the vote and spot checks are taking place.
