As a Jewess in the US, I believe the gulf oil platform was sunk by a North Korean Stealth Torpedo, the 2nd test of the same type that they used to take out the South Korean Navy ship last month.
Wouldn't need to be particularly stealthy - nobody on a floating oil rig in the Gulf would be expecting an attack of that sort. Although the probabilities still favor an accident scenario, Biden did warn that foreign powers would test Obama. Can't really dismiss any possibilities at this point.