FREETOWN, April 5 (Xinhua) -- Presidential candidate of the All People' s Congress (APC), Samura Kamara has on Thursday threatened to challenge the outcome of the presidential runoff.

Kamara refused to congratulate president-elect Julius Maada Bio and stated that the National Electoral Commission failed to look into complaint made by the APC regarding voting in the eastern part of the country, stronghold the Sierra Leone People's Party (SLPP).

He was speaking on the Sierra Leone Broadcasting Corporation radio, where he called on supporters of the party to exercise patience and allow peace to rein.

The presidential runoff election was contested between Maada Bio of the SLPP and Samura Kamara of the APC. Maada emerged winner with 51.81 percent of votes while Kamara secured 48.19 percent.

Julius Maada Bio has been sworn in as the president of the country and his inauguration would take place anytime soon.

The APC was the ruling party before this election.