On Thursday evening the Saudi anti-terror chief (and member of the Saudi royal family) emerged relatively unscathed from an al-Qaida suicide attack at his home.

This follows increasing warnings during the summer about Yemen and the potential for a spill-over into Saudi Arabia.

Security has been tightened at major Saudi oil facilities (as indicated by this, which was posted a few hours ago):
http://uk.reuters.com/article/idUKLU...090830?sp=true

Abqaiq and Ras Tanura are the only facilities in the world that handle more than 3 million bpd (each handles about double that, more like 5-6 mbpd).