An interesting overview of the system that provides oversight of deployed ICBMs and continuous monitoring of their status (the one that keeps them in high readiness) mentions that the system was created after two accidents in 1967 - in divisions in Perm and Krasnoyarsk (these must be Bershet' and Krasnoyarsk - both have been liquidated). The article gives few details of the accidents, but mentions that "an explosion of missiles" in Krasnoyarsk resulted in casualties.
The accidents must have involved UR-100 missiles that were being deployed at a very high rate at the time. It appears that after the oversight and monitoring system was introduced there were no more (serious) accidents involving deployed ICBMs.
UPDATE: The accident in Krasnoayrsk (36 missile division) happened on 5 August 1967. It was one of the first UR-100 regiments that began combat duty in November 1966. Engines of one of the missiles ignited in the silo leading to an explosion that killed 13 people.
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I apologize for this off-topic question!
The Head of the Russian Defence Ministry's International Department considers it possible to make use of interceptors in Poland for a decapitation strike against Russia using nuclear warheads?
Thanks for your answer!
Gerhard: Yes, this is one of the theories that circulate in Moscow. That doesn't mean there is anything to it.
Dear Pavel! Is it technically feasible to 'upgrade' the GBI's in Poland (Lithuania)with nuclear warheads and target Moscow? Or is it mere propaganda?
It's not entirely impossible, but it is propaganda anyway.