Tensions over immigration erupted into violence in Pretoria, South Africa, this week.

What's behind attacks on foreigners in South Africa?
A series of attacks targeted foreign workers and their businesses across South Africa.
South Africa is experiencing a rise in what is being described as "xenophobic" violence.
Locals are accusing migrants of stealing their jobs and blaming them for a high crime rate.
About two million foreigners live in South Africa and a majority of them were born in other African countries, including Zimbabwe, Nigeria and Somalia.
On Friday, police used rubber bullets and stun grenades a demonstration in Pretoria when protesters clashed with migrants.
President Jacob Zuma has condemned the violence, but he also said the authorities will crack down on undocumented workers.
What can be done to calm fears about foreigners working in the "rainbow nation"?
No longer the thriving economy it used to be.
South Africa's unemployment is over 30%.