The four are accused of plotting attacks against national key points.

If found guilty, they could face life in prison.

The suspects appeared in the Middelburg Magistrate's Court on Monday.

They're associated with the National Christian Resistance Movement, which is understood to be a right-wing, white supremacist organisation.

Self-proclaimed founder and leader Knoesen was arrested on Thursday.

His three co-accused - Riana Heymans, Eric Abrams and Errol Abrams - were arrested on Sunday.

eNCA