As in every election since 2003, CLEEN Foundation deployed observers during the Presidential and National Assembly elections held on Saturday 28th March, 2015. With support from Justice for All (J4A) Program of UK Department for International Development (DFID), CLEEN Foundation recruited, trained and mobilised a team of five hundred and twelve election observers to observe the conduct of security personnel in order to measure their effectiveness and adherence to the benchmark of acceptable behaviour. Furthermore, the Foundation printed and circulated posters and flyers of the abridged version of the Police Service Commission’s Guidelines for the Conduct of Security Personnel on Election Duty with the aim of enlightening the police and the general public in this important exercise of ensuring effective and accountable policing during elections. This information, education and communication materials provided the public with hot-lines for complaints, report and commendation on the general conduct of the security personnel and the election proceedings in general. This interim report presents our findings during the just concluded presidential and national assembly elections in Nigeria.