At the stage of completion the well was at it would have made a poor target for sabotage. Most wells at the stage this one was in would have 100% isolation between the formation and casing. A more likely scenario is that the casing was somehow damaged while running it and a poor cement job, possibly caused by the damaged casing, allowed gas/oil into the casing. There are a number of scenarios that could have caused this, but sabotage would be extremely low on the list. The cause was probably a series a freak events that caused what we see today.
When was the last oil rig explosion and where??