Witnesses say several people died when soldiers opened fire in Lagos but the army calls it "fake news".
A number of people taking part in a protest against police brutality have reportedly been shot dead or wounded in Nigeria's biggest city, Lagos.
Witnesses said up to 12 people were killed and others wounded when soldiers opened fire. Amnesty International said it had "credible reports" of deaths.
The state governor said about 25 people had been wounded but denied there were any fatalities.
An indefinite 24-hour curfew has been imposed on Lagos and other regions.
Protests over a now-disbanded police unit - the Special Anti-Robbery Squad (Sars) - have been taking place for two weeks, with demonstrators using the social media hashtag #EndSars to rally crowds.
As tensions continued to rise on Wednesday, police in different districts of Lagos fired shots in the air to disperse protesters defying the curfew, the BBC's Nduka Orjinmo reports from the capital, Abuja.
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The eyewitness accounts I heard this morning (BBC World Service) said at least 20 were killed and that the police/army were removing the dead to undisclosed locations.