I've heard of arsonists among firefighters. They were being paid extra if there was a fire, so they decided to torch some old buildings.
If they only knew the possibilities this crypto industry has to offer

Rumor is three different buildings burnt down.
What usually happens with overloaded cables is.. it all seems to be running fine.. until you get a some hot weather or an extractor fan fails.
Three separate buildings going up wouldn't be a surprise, the heat from one fire, causes the overloaded cables in the next building to fail.