Personally speaking,,,as someone else has already suggested, this sounds like a test run to test the feasibility and effectiveness of such an act of sabotage.

I'd love to know how the perpetraters evaluated the effectiveness of this act. It looks to me though, that we can expect more and bigger such attacks upon our communications, command and control (C3), which would be a precursor to a bigger more physical attack upon the population.

Then again, I could be chasing butterflies out in right field!