 He said, it has meant everything to me and I have given it my all, but it's time for change and for a new chapter. There'll be more on that on our website at bbcnews.com. In Oman, four people have been killed and several more wounded in a shooting near a mosque, an extremely rare incident of public disorder in the country. Our Middle East Corral analyst, Sebastian Usher, joins us now on the newsroom. And Sebastian, what do we know about this?