A gunman on a motorbike has shot dead the 20-year-old youngest brother of a prominent anti-drug activist in the southern French city of Marseille in a possible warning over his campaigning, a prosecutor said on Friday.

France's second largest city is struggling to battle drug crime, with more than a dozen people killed since the start of the year in turf wars and other disputes linked to cocaine and cannabis dealing.

Amine Kessaci, 22, became an activist and Green party member after losing an older brother to a feud between drug traffickers in 2020.

An unidentified gunman killed his youngest brother on Thursday afternoon.

"A motorbike drew up beside the car of the victim, who had just parked. The backseat passenger on the motorbike shot the victim several times," Marseille prosecutor N

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