Over 2,000 protesters gathered in central Tunis, following President Saied's decree establishing a new judicial watchdog that lets him dismiss judges or block their promotion.
The move came after Tunisia's Supreme Judicial Council rejected President Kais Saied's move to dissolve the body, saying it would continue to carry out its duties.
The state body has rejected President Saied's decision to dissolve the council, saying it will continue carrying out its work despite pressure.
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.
Saida Akremi, wife of former deputy chairman of the Ennahda party Noureddine Bhiri, has started a hunger strike to protest his continued detention.
Former President Moncef Marzouki has been accused of undermining the country’s security by seeking intervention from foreign parties.
President Kais Saied says the parliament, suspended almost five months ago, will remain so until elections in December 2022 and calls a referendum on constitutional reforms in July.
Tunisians demonstrators have gathered near the country's parliament in the capital Tunis as security forces have been deployed in an attempt to prevent them from reaching the building.
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 wrong political choices of the leadership of the Ennahda movement led to its isolation and failure," 113 senior officials from the party said in a joint statement.
Tunisia's judiciary says it is investigating the two biggest parties in parliament, Ennahda and Heart of Tunisia, which have both accused President Saied of launching a coup.
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.
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