Stupid religion, this is another case of islamists destroying examples of "idolatry" (other than their own, of course), like when the Taliban dynamited the Bamiyan Buddhas. ISIS itself just destroyed many treasures from the Mosul Library last month.
This also reminds me an argument I often have with most people, when they say ancient artifacts should always be kept by their countries of origin. See what can happen? If these statues had been on the British Museum or the Louvre, they would be safe!