Four people, a woman and three men aged between 20 and 24, were arrested in raids on homes in Newclare and Azaadville.
The arrests bring to an end a year-long investigation by the Hawks and the State Security Agency.
Hawks spokesperson, Brigadier Hangwani says twin brothers Brandon-Lee and Tony-Lee Thulsie have been charged with conspiracy and incitement to commit the crime of terrorism, as well as conspiring and attempting to commit acts associated with terrorist activities.
The twin brothers appeared at the Johannesburg Magistrate Court earlier today.
The two other suspects, a brother and sister, Fatima and Ibrahim Mohammed Patelwere, were found in possession of ammunition and stun grenades in Azaadville.
They appeared in the Kagiso Magistrates Court.
Hangwani says the cases are separated due to demographics, but the two cases are linked.
In terms of other group in South Africa, we can safely say they were not working with anyone.— Brigadier Hangwani, Hawks spokesperson
The four of them, we are believing, were working as a team. Any other groupings that are outside the country, those are the matters that are dealt with separately.— Brigadier Hangwani, Hawks spokesperson
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This article first appeared on 702 : Hawks: Four terrorism suspects not linked to any known South African group