Fifteen men attacked an electoral counting centre in Lagos state after pretending to be electoral officials.
Soldiers were forced to intervene in the matter to restore calm at the polling station. According to the party ward secretary, Mr Jacob Sulemain Hoodlum's boys just came and started coming out with daggers and hitting people that are Labour Party agents.
This presidential vote is expected to be the most contested one since the country transformed from military rule in the 1990s. Candidates from two major parties, the All Progressives Congress (APC) and the peoples Democratic Party (PDP), have been alternating power in presidential elections but are now faced with significant opposition from minor parties such as the labour party led by Peter Obi, tallying has started in substantial parts of the country and results are expected to be streaming in as the voting process officially ended on Sunday.
The voting process was smooth in many places, while Widespread delays overshadowed the country's crucial presidential election when millions voted to choose their new leader. The hotly contested election is taking place alongside elections for members of the country's parliament.
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Some polling stations in Abuja witnessed chaotic scenes as a large crowd of voters struggled to cast their ballots. The voting station has minimum privacy as voters could see what the person close to them was doing or who they were voting for.
"People are voting in exposed spaces, and everyone can see who they are voting for. There's no privacy. I won't be surprised if this polling unit is cancelled," Elias Ajunwa, one registered voter, told CNN.
Nigeria has 93 million registered voters, and about 87 million are holders of a permanent voter card (PVC), a primary requirement to cast a ballot. The country is Africa's largest economy, and the election is the continent's largest democratic exercise.
Kenya's former president, Uhuru kenyatta, was appointed to lead the African Union envoy to oversee the election in Nigeria.
