JOHANNESBURG (AP) — Several South African universities have reported violent protests by demonstrators who are persisting in efforts to disrupt classes as part of a campaign for free education.

The University of Cape Town and Rhodes University in the city of Grahamstown are among institutions that reported Tuesday on alleged vandalism and stone-throwing by protesters.

The University of Cape Town says there have been many reports of confrontations between protesters, people who oppose the disruptions, and private security guards on campus. It says police have also been involved, setting off two stun grenades and a smoke grenade to disperse protesters.

Protests have been held on numerous South African campuses since last month. While there is widespread support for the goal of free education, many students also want to complete their studies.