France, Nov. 22 -- Demonstrators chanted "Justice for Mehdi" before observing a minute of silence at the roundabout where 20-year-old Mehdi Kessaci was shot dead by a gunman in his parked car on 13 November.

Investigations are ongoing but authorities consider the murder to be a "warning crime" linked to the anti-drug activism of his brother Amine Kessaci, 22, who was welcomed by cheers as he joined the crowd on Saturday.

Amine Kessaci is now living under police protection and the gathering was marked by heavy police presence in the southern port city hard hit by drug crime.

The young anti-drug and environmental activist threw himself into campaigning after his half-brother Brahim was murdered in a drug-trafficking feud in 2020.

"I dem...