ISIS, which comes up with more and more heinous methods of execution, has ramped up its cruelty: Members of the group tied three people to the pillars in the ancient section of Palmyra and killed them by detonating the pillars, the Syrian Observatory for Human Rights reported.<br />The group said it learned of the killings from local sources in the city, which has been under ISIS control since May.<br />ISIS jihadists seized control of Palmyra, a UNESCO World Heritage Site, and the surrounding area from Syrian government forces on May 20.<br />Since then, the Islamic extremists have beheaded the antiquities expert who looked after the ruins and set about demolishing their architectural riches.
