He rejected as legally inappropriate the civil liberties union's challenge to the deployment of mounted police to disperse demonstrators.
Police may use tear gas, water cannons, or rubber bullets to disperse demonstrators.
Security forces fired into the air on Monday to disperse demonstrators in the commercial capital Lagos.
Police used water cannons to disperse demonstrators who threw rocks.
He expressed his deep concern and disturbance "by the violent means used to disperse demonstrators."
Riot police used tear gas and batons to disperse demonstrators.
It condemned the military, which had caused the deaths by trying to disperse demonstrators.
A spokesman said troops opened fire to disperse demonstrators in two protests.
The police made an attempt to disperse demonstrators and to prevent new people from joining them, but failed.
The Commission condemned the military, which was blamed for many deaths when dispersing demonstrators.