A Tunis court, which is investigating the incident, has made no mention of whether the victim was one of those who took part in Friday's demonstration.
Friday's protest was against a ban on all indoor or outdoor gatherings the government of President Kais Saied announced this week to stop a Covid-19 wave.
United States calls for a transparent and inclusive reform process four months after Tunisia's President Kais Saied seized power in a move his critics called a coup.
Najla Bouden Romdhane, a little-known professor of geophysics who implemented World Bank projects at the Education Ministry, has been tasked to form a government as quickly as possible.
The protest, accompanied by a heavy police presence, was the first since President Kais Saied declared on July 25 he was sacking the prime minister, suspending parliament and assuming executive authority.
Country's biggest political party, Ennahda, orders its supporters not to resume a sit-in outside parliament, in a reversal of an earlier call by its leader Rached Ghannouchi to take to the streets.
Supporters of president as well as those of major political party Ennahda mobilise on streets across Tunisia, leading to violent confrontations threatening to draw in security forces or prompt a military power grab.
Speaker Rached Ghannouchi, head of Ennahda party, says he and other legislators consider state institutions as operational as per constitution after President Kais Saied ousted PM Hichem Mechichi and suspended legislature for 30 days.
Security forces ordered offices of broadcaster Al Jazeera to be shut down, according to a statement by the Qatar-based network on its Facebook page.
Tunisians mark the anniversary of 2013 killing of a prominent activist and protest against allegations of police brutality in a rally backed by a powerful labour union.
Over 600 protesters were arrested overnight even as the army were dispatched to several cities to stop violent demonstrations over price hikes, taxes and unemployment.
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