The police chief in neighboring South Sudan has announced a nighttime curfew to calm tensions after a series of attacks on Sudanese-owned businesses and homes.

Three people were killed and seven injured in violent clashes with security forces in the capital Juba and the northwestern town of Aweil, police said. Their nationalities have not been revealed.

According to officials, three houses belonging to Sudanese nationals were set on fire in Aweir.

No one is allowed on the streets between 18:00 and 06:00 local time (16:00 and 04:00 GMT) to "prevent any infringement of public and private property," Inspector General Abraham Manyo Abraham Manyuat Peter said on Friday.

Another police source told the BBC that police rescued 45 Sudanese businessmen in Juba and that they are currently under police protection.

After a long civil war, South Sudan broke away from Sudan to form an independent country in 2011, but recently, more and more Sudanese have fled to South Sudan to escape the recent conflict.

Sudan has become the world's worst humanitarian crisis since the country's warring generals first turned on each other in April 2023. The United Nations says half of the country's population, about 25 million people, are in urgent need of food and aid.

Recent videos showing alleged killings of South Sudanese civilians by Sudanese soldiers appear to have taken place over the past few days in the city of Wad Madani, the capital of the central Sudanese state of Gezira.

Human rights groups confirmed that at least 13 people - including some children - were killed there on racial grounds.

People with darker skin tones say racism is endemic in Sudan, with today's precedent for targeted attacks by light-skinned Arab fighters against those communities in places like Gazira and Darfur.

Slave raiding was widely reported to have continued until the end of the civil war in 2005, which led mostly black African South Sudan to secede from Arabic-speaking Sudan six years later.

The incident shown in the viral video was condemned by South Sudanese people at home and abroad.

Hundreds of young men, angry about what they saw in the video and seeking revenge, attacked Sudanese businesses in Juba and other parts of South Sudan on Thursday.

Gunshots were heard throughout the night as security forces patrolled.

The BBC watched as dozens of young people, mainly in their 20s, ran along Tambura Road, one of the busiest streets in the suburb of Atrabala in Juba, as they were chased by police.

On Friday, shops and businesses in Juba, including the country's largest market, Konyo Konyo, stay closed. Restaurants and cafeterias have also been put on lockdown as owners take precautionary measures.

On Friday, the price of bread in several local bakeries opened in Juba increased by 17%.

Police continue to hunt young men who move from one community to another, targeting Sudanese residents. The BBC understands that dozens of police have been deployed to protect Sudanese people and their businesses in the suburb of Atarabala C and other areas.

We see a police car rounding up and taking away a group of young people.

Witnesses in Wau, the country's second-largest city, told the BBC by phone on Friday that hundreds of angry young men attacked Sukocho, a popular market home to many Sudanese-owned businesses.

They also tried to rob some shops, but police fired several live rounds into the air to disperse them.

Spontaneous demonstrations were reported on Friday in the town of Toni in Warrap state, the hometown of President Salva Kiir.

The BBC was unable to independently verify claims of attacks and looting outside Juba.