Hundreds of protesters marched to the gates of Nigeria's parliament on Thursday, hours after the army said it was ready to step in and restore order after more than a week of demonstrations against police brutality.
The protest defied a ban on mass rallies in the capital Abuja that the government said was imposed earlier on Thursday to stop the spread of the coronavirus.
Chanting crowds also blocked roads and waved flags and banners in the commercial hub Lagos, where protesters reported clashing with unidentified men wielding weapons.
Video on social media appeared to show men coming out of a bus and chasing protesters, though Reuters could not verify the footage.
"We have suffered enough. We youths want to stand - no more brutality," one demonstrator, Obinna Paul, said in another part of the city where crowds blocked a toll gate funnelling traffic to and from the main airport.
Lagos state governor Babajide Sanwo-Olu said on Twitter he condemned the attacks on peaceful protesters "by armed and unscrupulous elements trying to cause chaos".
Lagos state set up a 200 million naira ($525,000) compensation fund for victims of police brutality, a core demand of protesters, and a presidential spokesman said on Twitter that the government had directed all governors to establish victim compensation funds. He also said judicial panels of inquiry would investigate police brutality.
Late on Wednesday, the military issued a statement titled "Nigerian Army warns subversive elements and trouble makers".
"The NA (Nigerian Army) is ready to fully support the civil authority in whatever capacity to maintain law and order and deal with any situation decisively," it said.
Protesters have staged daily marches since Wednesday last week, calling for an overhaul of police forces.
Police had responded to the demonstrations with beatings, tear gas and gunfire, which human rights group Amnesty International said had killed at least 10 people. But the police agreed on Tuesday to stop using force against protesters.
In response to the protests, the head of Nigeria's police force on Sunday dissolved the Special Anti-Robbery Squad (SARS), a unit that demonstrators have accused of beatings, killings and extortion.
Demonstrators have called for more meaningful reforms. Protesters say they fear a new unit, whose creation to "fill the gaps" left by SARS was announced on Tuesday, was just a rebranding of the squad.
($1 = 380.6000 naira)