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The debris suggests that it was a BrahMos. Furthermore, S400 cannot do the damage that was photograh depicted. As to the how and why of it, your guess is as good as mine.
Was it even a brahmos or something else ?
Given things are quiet why would a brahmos not be in storage and put on a launcher. The base commander, unit commander all will need to be sleeping for such a thing to happen.
Someone on this forum suggested it to be an S-400 missile. Could it be an AD unit running a test did a live fire. Given we just inducted those I would hazard a guess and suggest the procedures will be the most vulnerable there.
The debris suggests that it was a BrahMos. Furthermore, S400 cannot do the damage that was photograh depicted. As to the how and why of it, your guess is as good as mine.