BAMAKO, Mali—Jihadi rebels kidnapped French journalist Olivier Dubois on April 8 while he was working in Mali’s northern city of Gao, the chief of Reporters Without Borders has announced. A video released Wednesday shows Dubois saying he was kidnapped by the al-Qaida-linked group JNIM. In the video he calls on his family, friends and authorities to work for his release. The video could not be independently verified. Reporters Without Borders chief Christophe Deloire confirmed the kidnapping to The Associated Press, and called for the reporter’s release. “We ask the Malian and French authorities to do everything possible to obtain his release and send all our support to his family and loved ones,” he posted on Twitter. Dubois was reporting in Gao in northern Mali and did not return to his hotel after lunch on April 8, Deloire said. Dubois usually works for LePoint Afrique. The French Foreign Ministry confirmed his …