Police fired rubber bullets and used a water canon and tear gas against ANC members who threw stones at EFF supporters near President Jacob Zuma's Nkandla residence on Saturday.
The Economic Freedom Fighters were handing over a house they had built, next to Zuma's homestead, to a woman and her grandchildren.
A heavy police presence monitored the situation since Saturday morning and had kept the two groups separate.
The ANC supporters were on a hill nearby when EFF members emerged from their meeting and began singing.
Some of the ANC group began throwing stones at them and police intervened using truncheons, a water canon and tear gas. Rubber bullets were fired and people ran and dived for cover.
ANC members earlier blocked the road leading to the house and prevented EFF leader Julius Malema's car from driving past. Malema then got out of the car and walked through the crowd to get to the house.
After he made it through, ANC supporters began throwing bottles of water and stones. - Sapa