Check out "Operation Immediate response" for proof enough of USA complicity. Take a look and make your own mind up!. This seems a Cold War return over Oil, always Oil. Cuts the Russians off from Iran as well. This is interesting as Russia had an alliance, although much under reported that they would help Iran if they were attacked.
The text of the news may be a little difficult to see but if you pause it you should get the point of why I put them in.