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Nigerian police have beefed up security outside South African-owned businesses in the capital, Abuja, the BBC's Ishaq Khalid reports.

They are expecting protests following the violence in South Africa, where some foreign-owned businesses have been targeted.

Shops of the South African telecoms giant MTN are among the possible targets for protests, our correspondent says.

The Reuters news agency is reporting that MTN has decided to close all its outlets until further notice.

"The safety and security of our customers, staff and partners is our primary concern," Reuters quotes an MTN Nigeria statement as saying.

On Tuesday, witnesses told the BBC that a branch of the South African supermarket Shoprite was vandalised in the Lagos neighbourhood of Lekki.