NOT CONFIRMED:

[link to twitter.com (secure)]
"There are early, unconfirmed local reports of suspected ballistic missiles falling east of the Saudi capital Riyadh."

[link to twitter.com (secure)]
"It is worth noting that there have been no claims of responsibility thus far from Houthi rebels in Yemen and readers from Riyadh responding in this thread are denying there has been any explosion or event there."

From Evan Kohlman NBC News. Could be that foreign field agents are fucking with the Media, taqiyya. Or hacking going on. Or a number of different scenarios, including the actual explosion and information being suppressed.