Demonstrators shouting slogans for and against Mr Zuma hurled bricks and attacked passing vehicles outside the African National Congress’s Johannesburg headquarters.
Mr Zuma, whose tenure has been engulfed by corruption scandals, is due to deliver the annual state of the nation address on Thursday, despite calls for him to step down amid a growing political crisis.
The party announced it will hold an emergency meeting on Wednesday of its decision making body, the National Executive Committee (NEC), in a move that could force the 75-year-old from office after he reportedly refused to resign.
Outside the headquarters on Monday, a middle-aged woman groaned in agony a she was repeatedly kicked in the stomach by a senior member of the ruling ANC.
Mr Zuma still commands a loyalist faction, including in his home province of KwaZulu-Natal.
"We are here to defend the state president,” said Abi Letsoalo, from the activist group, Black First Land First who support Mr Zuma’s call to seize white-owned farm land without compensation. “Our message is clear: the president will be the president until his term of office has expired.”
Mr Zuma's presidency has been dominated by corruption scandals. He faces several court cases, including over 783 payments he allegedly received linked to an arms deal before he came to power in 2009.
Many graft allegations against Mr Zuma have centred on the wealthy Gupta family, who are accused of unfairly obtaining lucrative government contracts and even being able to choose ministerial appointments.
The NEC has the power to oust Mr Zuma with a majority vote. Failing that, it is widely expected that parliament will overwhelmingly support a vote of no confidence against him later this month, which will expel him from office. PLACE YOUR TEXT ADVERT BELOW:>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> How I Made Me =N=2.5 MILLION In 7 Days from 2 Common Product I Imported and how you can do the same. Click HERE FOR FREE Details right now Warning To Men: This 3 Foods Is Killing Your Erection. Click Here To Know Them Secret Fruits that increased my Manhood and makes me last 55 minutes+ all time - Click here to get it Warning: Got Arthritis? 3 Simple Ways To Get Cured And Be Permanently Free From Joint Pains. Click Here To See Them REVEALED!! Reduce Your Blood Sugar Level And Reverse Diabetics Within A Short Period Of Time. Click Here To See How MIDNIGHT,Pressed Mr Kilanko Suddenly Couldn't Urinate. Shrink your Enlarged Prostrate Here! Click Here Now