South Sudanese authorities have imposed a countrywide dusk-to-dawn curfew after a night of violence during which businesses run by Sudanese traders in the capital were looted. Police chief Gen. Abraham Manyuat said Friday that the curfew will commence from 6 p.

South Sudan's President Salva Kiir has called for calm and urged citizens not to take the law into their own hands, following a spate of attacks on businesses and homes owned by people from neighbouring Sudan.