As pockets of unrest flared again on Saturday in parts of the country, a spokesman for southern Cross River state said several buildings had been vandalised over the last two days including a shopping mall, a bank and electoral offices.
A round-the-clock curfew was reimposed on parts of the central city of Jos, just a day after it was relaxed on Friday, following the looting of emergency food supplies stored there by the disasters ministry, authorities said.
"This looting has spread to other facilities and is gradually degenerating thereby threatening the peace and security of the state," the governor of Plateau state, Simon Lalong, said in a statement.
And a round-the-clock curfew was imposed in the northern state of Kaduna on Saturday. The move was to "protect lives and property and contain criminal elements", state security commissioner Samuel Aruwan said in a statement.
The Nigeria Police Force said its inspector general Mohammed Adamu had ordered the immediate deployment of all assets and resources to end violence, looting and destruction of property by criminals masquerading as protesters.
"The IGP enjoins law-abiding citizens not to panic but rather join forces with the police and other members of the law enforcement community to protect their communities from the criminal elements," the force said in a statement.
During a call on Friday between Buhari and former Nigerian presidents, the head of state said 51 civilian fatalities and 37 injuries had been recorded as a result of "hooliganism" in recent weeks, according to a statement released on Saturday outlining his opening remarks.
Unrest escalated in parts of Nigeria after the shooting of the protesters who gathered in Lagos on Tuesday night in defiance of a curfew to demonstrate against police brutality.
Olusegun Samuel, the guardian of one protester who was shot at that demonstration, said on Saturday that the 24-year-old may have his right leg amputated due to a severe wound.