LIBREVILLE: Security forces in Gabon violently charged at demonstrators gathering Saturday in Libreville in the lead-up to presidential elections and beat an Agence France-Presse cameraman covering the protest, a colleague said. Defying a heavy police presence, hundreds of protesters took to the streets in opposition to President Ali Bongo Ondimba’s candidacy for reelection on Aug. 26, the AFP correspondent said. Some 15 opposition leaders also attended the protest, forming a human chain at the front of the crowd. Among them was presidential candidate Guy Nzouba Ndama, the former parliamentary speaker. The young protesters broke into song, chanting the national anthem as the security forces began firing tear gas at the crowd. Police then moved to break up the protest and several shots were heard.