South African President Cyril Ramaphosa on Thursday warned that the government would act against any efforts to disrupt the country ahead of planned anti-immigration demonstrations next week, as tensions over migration continue to rise.

The marches, organized by citizen groups, follow calls for undocumented foreigners to leave the country by June 30. The deadline has fueled concerns over a possible return of xenophobic violence, which has previously resulted in deaths.

"We will not tolerate any attempts to destabilize the country by anyone, whether marching or otherwise," Ramaphosa told the upper house of parliament, adding that security forces were prepared to respond to any violations of the law.

Authorities have increased security measures ahead of the planned protests, while government officials have engaged traditional leaders, including the Zulu Royal House, in efforts to prevent unrest.

South Africa has experienced weeks of anti-foreigner tensions, with violence reported in some areas and at least three deaths confirmed by officials. Mozambican authorities have reported a higher death toll among their citizens.

The campaign has also led thousands of foreign nationals from countries including Ghana, Malawi, Mozambique and Nigeria to return home voluntarily.

Temporary camps have been set up in Durban and Johannesburg as people wait for transport, with aid organizations warning of a growing humanitarian challenge.

Ramaphosa said the government was working to ensure June 30 passes as a normal day, allowing people to continue with their daily activities.