Nigeria's 2007 election 'marred by fraud'
27 September 2010 Last updated at 12:51 BST
In 2007, after a week of violence involving at least 200 deaths, Nigeria elected a new president.
The election was won by a candidate from the governing party amid allegations of widespread vote-rigging. Will Ross reports.
Contributors featured in this report: Jibrin Ibrahim and Olusegun Obasanjo