Roads around the ANC's headquarters in Johannesburg were open on Wednesday morning, when Youth League leader Julius Malema's disciplinary hearing was set to continue.
"Right now the situation is back to normal," said Johannesburg metro police spokesman Wayne Minnaar.
"There's a possibility that it could change."
The African National Congress earlier said the hearing of Malema and his five co-accused would continue at Luthuli House, despite violent protests by his supporters there on Tuesday.
Gauteng police spokesman Lt-Col Lungelo Dlamini said there was a strong police presence in town.
"Our members are still there in town."
Roads would be closed again, "if there are some problems", said Dlamini.
A policeman was hospitalised on Tuesday and six journalists were hit by rocks, including a Carte Blanche cameraman, Dudley Saunders, who had a bleeding gash on his forehead, The Times newspaper reported on Wednesday.
Sapa photographer Werner Beukes, two eNews journalists Belinda Moses and Cathy Mohlahlana, The Star photographer Boxer Ngwenya and Citizen photographer Michel Bega were also hit by rocks thrown by Malema supporters.
The ANC initially said the hearing would be moved to a different venue, but spokesperson Jackson Mthembu on Wednesday morning said it would continue at Luthuli House.
"The hearing will be held at Luthuli House, however if the situation does not improve from Tuesday, it will be moved to an alternative venue," Mthembu said.
"The National Disciplinary Committee would make the final decision when or if to move venues."
Rioters thronged Johannesburg's city centre on Tuesday, hurling broken bricks at police and journalists, and burning pictures of President Jacob Zuma.