The Saudis have apparently also requested the closure of Al Jazeera - and the expulsion of two US think tanks based in Qatar.
I guess the Qatari plan to make the country a hub of free speech/thought in the ME is a major target. Can't imagine the Saudi govt is too happy with its citizens bypassing official news channels and getting its info from Al-J.
Saudi Arabia threatens to blockade Qatar over terrorism - The Irish Times - Tue, Mar 11, 2014
Interesting story to watch; this could get ugly quickly.