Security measures have been heightened amid concerns over potential unrest and illegal immigration

Eastern Cape Premier Oscar Mabuyane has moved to calm nerves ahead of Tuesday's anti-immigration protest, saying residents should go about their day as usual.

But he warned would-be troublemakers that anyone involved in violence, intimidation or incitement would be dealt with decisively.

"SA remains a constitutional democracy founded on the rule of law, human dignity, and the protection of all persons within its borders," he said.

"As government, we remain open to engagement on the matters that have been raised, and we appreciate that last week's march in the province was conducted in compliance with the law.