"Tuesday's shootings of protesters who were holding the Nigerian flags at the Lekki Toll Gate in Lagos, and the attendant destruction of private and public property, have thrown thick clouds of uncertainties over our nation's skies, thereby unleashing ominous signs on our country".
He said at least 25 people were wounded.
She added that reports of CCTV cameras and lighting being disabled before the shooting was "disturbing as, if confirmed, they suggest this deplorable attack on peaceful protestors was premeditated, planned, and coordinated".
On Tuesday following the events at Lekki, U.S. presidential candidate Joe Biden urged Nigerian authorities to cease the "violent crackdown on protesters" and former presidential candidate Hillary Clinton tweeted calling on Nigeria's president Muhammadu Buhari to "stop killing young #EndSARS protesters".
"Now they have seen what we are capable of", one angry youth said, "We are just hungry, we are exhausted".
"We join others around the world in demanding the Nigerian government end the attack on protesters and we call for justice for those who have been injured and killed by all Nigerian forces", said the statement from the Movement for Black Lives, a coalition of more than 50 grassroots groups that make up the broader Black American liberation movement.
Protests against police brutality in Nigeria have been going on for weeks, and some areas are under curfews after a day of violence.
The president shrugged off condemnation from the US, African Union, European Union and Britain over the excessive use of force by the authorities.
Nigerian President Muhammadu Buhari spoke to the nation about the unrest that has gripped the nation in recent days, urging calm but without mentioning the Tuesday night military shootings.
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The army has denied soldiers were at the site of the shooting at Lekki toll gate in Lagos, where people had gathered in defiance of the curfew.
In a televised briefing Wednesday, Lagos governor Obaijide Sanwo-Olu said he has ordered an investigation into the military's actions at Lekki.
Buildings including police stations and the National Port Authority were torched and clashes erupted in several locations on Wednesday.
Sanwo-Olu said, "For clarity, it is imperative to explain that no sitting governor controls the rules of engagement of the military".
A coalition of civil society organisations in Nigeria said on Wednesday that they were "deeply shocked by the killing of peaceful protesters".
As such, Nigerians have been taking to the streets by the thousands to combat police brutality, a protest that has since escalated into violence.
Nigeria, where the median age is 18, is a tinderbox of profound economic and social grievances. Heavyweight boxing champion Anthony Joshua, whose mother is Nigerian, said "the violence and killings are horrendous". Buhari's office said the dissolution of the SARS was "the first step" in a set of reforms that "will deliver a police system accountable to the Nigerian people".
Since Tuesday, Rihanna, Beyonce, Nicki Minaj, Ugandan pop star-turned politician Bobi Wine and Manchester United striker Odion Ighalo added their names to a list of celebrities who have supported the protesters.