Islamic State ties captives to ancient Roman columns and explodes them

I'm interested in learning what Koran verse justifies this apalling atrocity.

From CNN:

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. The London-based Syrian Observatory for Human Rights relies on activists inside Syria to document human rights violations in the country.