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(190509) -- TRIPOLI, May 9, 2019 (Xinhua) -- Fighters from forces of the UN-backed Libyan government are seen during clashes with Libyan National Army (LNA) troops at the Al-Yarmook frontline in Tripoli, Libya, on May 9, 2019. With intensified ground fighting and a significant increase in airstrikes on southern Tripoli, the United Nations is "extremely concerned" about heavy casualties, a UN spokesman said on Thursday. The conflict broke out over a month ago when forces loyal to Khalifa Haftar's self-styled Libyan National Army attacked Tripoli. (Xinhua/Amru Salahuddien)