Thursday, a fire ripped through the Russian Ministry of Defense’s 2nd Central Scientific-Research Institute in Tver, some 80 miles northeast of Moscow.

This “research institute” is responsible for designing surface-to-air missiles and ballistic missiles for Russia’s aerospace military programs.

There is no official number of casualties, but there are dozens injured and some fatalities.

The official story is that old construction and flammable insulation caught fire.

There are several takeaways from this conflagration.

What is unclear to me is how any accidental fire could have spread the way this fire did.