A renowned Russian conductor led a triumphant concert Thursday in the ruins of the ancient Syrian city of Palmyra, once terrorized by Islamic State, even as an airstrike on a refugee camp in the north left at least 28 people dead and dozens wounded, including many children.<br />The performance in the same ancient amphitheater where ISIS militants carried out widely publicized killings -- and called "A Prayer for Palmyra" -- was intended to send a message that Russia's presence in Syria would bring hope and stability.<br />The world-famous archaeological site was badly damaged by the ISIS militants who held Palmyra for 10 months before Syrian forces backed by Russian airstrikes retook it in March
