Nigeria’s president has sent an envoy to South Africa following the looting in Johannesburg.
The government alleges that Nigerian-owned businesses have been targeted in the South African city, saying, in a tweet, that “enough is enough”.
Other African governments have issued warnings to their citizens over the violence.
South African officials have blamed criminality rather than xenophobia for the current problems.
In a statement, Nigeria’s high commission in South Africa described the situation as “anarchy”, and has called on Nigerians to come forward to report what has happened to them.
Nigerian President Muhammadu Buhari wants the envoy to meet his South African counterpart to “express Nigeria’s displeasure over the treatment of her citizens; and assurance of the safety of their lives and property”.
On Monday, dozens of people were arrested in Johannesburg after rioters looted shops and torched buildings and vehicles.
Police fired tear gas, rubber bullets and stun grenades in an attempt to quell the unrest.
Violence continued on Tuesday in Johannesburg’s Alexandra township.
