Donald Trump supporters came to blows with police and security forces as they were celebrating the Republican's US election win, with 65 people being arrested and dozens more killed, local reports suggest.
While female rights groups and left wingers marched on Washington, a pro-Trump group from the Southern Rivers state in Nigeria held a rally of their own.
But trouble flared up when the Indigenous People of Biafra came to blows with police officers as they marched through the streets waving American flags and shouting anti-Nigerian government slogans.
A spokesman for the group claims 20 people are dead and 200 more are still missing.
PROTESTS at Trump's Inauguration Day
Fri, January 20, 2017
Protestors were chased through the streets of Washington as violent scenes broke out close to the Donald Trump inauguration in Washington.
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Police and demonstrators clash in downtown Washington after a limo was set on fire.
However, police deny these claims, saying there were no deaths and 65 arrests.
Pro-Trump supporter Ugochukwu Chinweuba claimed lawyers are working to locate and release those arrested by police.
Mr Chinweuba said he supported the new American President because he wanted "self governance" for his region, something the Nigerian government strongly opposes.
The Republican-backing demonstrations in Nigeria were in sharp contrast to rallies taking place across the world – in India thousands of women's rights campaigners marched in solidarity against Donald Trump's perceived sexism.
The Nigerian pro-Trump group clashed with police during their demonstration
The Nigerians said they liked Trump because they wanted more self determination themselves
There was also a Women's MArch taking place in Washington in response to Presient Trump's remarks about "grabbing women by the p****".
Left-wing groups also clashed with police at the republican's inauguration, throwing cement blocks at the new President's motorcade as it travelled to the White House.