Tunisian opposition activist Chaima Issa has begun a hunger strike to protest the violence she says she suffered during her arrest on Saturday, according to local media reports.

Her family said the prominent human rights activist was injured in the foot during her arrest and required medical treatment.

Issa was arrested to serve the 20-year prison sentence she received on Friday in a controversial mass trial, which saw sentences of up to 45 years handed down on appeal to dozens of opposition figures. They were accused of "conspiracy against state security" and "belonging to a terrorist group".

Right groups have condemned the trial as "politically motivated" and the latest verdict as being part of a "relentless campaign to erode rights and silence dissent".

The 37 defendants, most of whom were imprisoned after their arrest in early 2023, were accused of, among other things, meeting with foreign diplomats.