What's going on in Iran, again?

Another curious explosion in Iran, this time in Isfahan, the center of Iranian nuclear weapons research.  We've seen this before, of course.  The Washington Post gives a rundown of the known incidents:

A massive blast at a missile base operated by Iran’s Revolutionary Guard Corps nearly two weeks ago was the latest in a series of mysterious incidents involving explosions at natural gas transport facilities, oil refineries and military bases — blasts that have caused dozens of deaths and damage to key infrastructure in the past two years.
Iranian officials said the Nov. 12 blast at the missile base was an “accident,” and they ruled out any sabotage organized by the United States and its regional allies. The explosion on the Shahid Modarres base near the city of Malard was so powerful that it shook the capital, Tehran, about 30 miles to the east.

Despite the official denial of foreign involvement in the latest blast, suspicions have been raised in Iran by what industry experts say is a fivefold increase in explosions at refineries and gas pipelines since 2010.
Explaining the increased number of industrial incidents is proving to be a predicament for Iranian leaders, who do not want to appear vulnerable at a time when Israeli leaders have been debating military intervention against Iran over its controversial nuclear program.

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