Activists and news reports yesterday said some 45 people from both sides had been injured in the confrontation on the edge of the central city's university campus and outside the main court.
The protesters had come to offer support to two leftist students appearing in court, charged with the murder of an Islamist student who died of his injuries after clashes between the two camps in April 2014.
Local authorities said "several" members of the security forces were injured and had to be taken to hospital, adding: "The protesters used violence and threw stones."
Authorities said 17 students were arrested.
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