Correctional Services said that “matters are under control” at Johannesburg’s Sun City Prison on Wed.
Students at the Vaal University of Technology have gone on strike , calling for the immediate resignation of vice- chancellor Irene Moutlana.
The studentsyesterday started an "indefinite" strike at the university in Vanderbijlpark.
Student representative council (SRC) president Donald Manganyi said: "We declare this a non-academic year if the vice-chancellor does not resign with immediate effect.
"The vice-chancellor was on a renewable contract, and it was agreed that she should leave if she does not meet the students' demands. She has failed us and must therefore resign."
Manganyi claimed the institution's staff support the call for Moutlana's resignation.
"We are not striking because of fee hikes, but because of the poor administration service to students.
"We are being lectured by under-qualified lecturers and that means we are not getting quality education from the university."
He said Moutlana had also closed the "doors of engagement with the SRC and political organisations".
"Student leaders are victimised for trying to make students' lives better," Manganyi said.
University spokesman Babini Maneli said the students had not approached the university and they were unclear about the reasons for the protests.
The strike follows last Friday's move by more than 100 students from different institutions, who handed over a memorandum of grievances to the office of Education Minister Naledi Pandor in Pretoria.
Other higher education institutions involved in strikes include the University of Free State (UFS) and the Tshwane University of Technology (TUT).