Saudi oil attacks: Why would Iran strike now?

Who launched the attack? The Houthi militia in Yemen - who are backed and supplied by Iran - initially claimed the attack. But experts and officials are not convinced the grpup has the organisational or operational capability. The US and Saudi Arabia claim they have evidence that Iranian weapons were used and satellite images released by the US reportedly suggested the attack had come from the northwest direction. Why would Iran launch an attack now? As talks with EU members over the ailing nucl