ive just read this so now i know the answer in forensic detail
en.wikipedia.org
except that its obviously been censored as there is no mention of the CIA
one thing that i have long wondered about is what do ISIS say about Mecca and Medina?
the holy places of the hijaz, Mecca central to islamic practice as the direction of prayer and destination of haj, Medina is the mosque and the tomb of the prophet, currently under stewardship of the universally hated Saudi royals.
Isis always go on about their plans for world domination - their motto was "continuous and expanding", but they don't say clearly, as far as i have seen, what would their plans be for the holy sites.
They have fucked up a lot of ancient sites, non-islamic and shia sites as well as more mainstream islamic sites that sunnis revere - e.g Jonah's shrine, and i wonder whether they see Mecca and Medina in the same light, as a focus of worship that distracts from proper monotheism - and might want to destroy them too. The saudis are already bulldozing old islamic sites in saudi for similar reasons, but i wonder whether ISIS don't mention it because they don't want to alienate their Saudi supporters.
or as usual maybe it's just me being ignorant and the issue is obvious and the answer is well known
The last group of rabid extremists to get their hands on mecca apparently just wanted the house of saud out,
https://en.wikipedia.org/wiki/Grand_Mosque_seizure not to purge the temple or destroy it, a relatively little known but thoroughly brutal and prefiguring episode