#ZumaMustGo supporters threatened with firearms
A group of African National Congress (ANC) supporters under the banner of #ZumaMustGo was forced to change the starting point of their march to the Union Buildings.
They claim to have been threatened with firearms by rival ANC members.
Convener Hangwi Maumela says the other ANC marchers are unhappy with their planned march to call on Zuma to resign immediately.
"There has been a bit of fights now. There is some group of people that came with stones and firearms and then they put it out. We just said: 'No let's have a proper way of dealing with this matter'. We are continuing, we are just getting more private security people to come and help us."
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The march is set to start at Burgers Park in Pretoria.
The group vowed not the leave government's headquarters until President Zuma steps down.
The Tshwane Metro Police Department (TMPD) says they have turned down an application to march.
"We declared this march an illegal activity. We as police have put in contingency plans to make sure if it continues, we will be able to monitor the proceedings," says TMPD's Isaac Mahamba.
The African National Congress (ANC) in Gauteng has distanced itself from the march.