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Don’t know what did this kind of damage.
Anyway, that’s the evidence, as found on Oak Street north of SoPA and South of NoPA, so it’s up to you to figure the M.O.
[Oh, an angle grinder - that also could explain the burning. See comments.]
[Oh, it could have been an oxy-acetylene torch as well. See comments.]
Or it could have been Arnold – he has the equipment, anyway.