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.
The group said it learned of the killings from local sources in the city, which has been under ISIS control since May.
ISIS jihadists seized control of Palmyra, a UNESCO World Heritage Site, and the surrounding area from Syrian government forces on May 20.
Since then, the Islamic extremists have beheaded the antiquities expert who looked after the ruins and set about demolishing their architectural riches.