Mass anti-foreigner protests swept across South Africa, with more than 2,000 demonstrators marching through Durban alone as a self-imposed deadline for undocumented migrants to leave the country passed. At least four people have been killed and tens of thousands displaced amid weeks of escalating tensions. Authorities deployed police and military assets to major cities, citing fears of a repeat of the deadly 2008 anti-migrant violence that left 62 people dead.