The maniac who set a woman aflame on a Chicago Transit Authority Blue Line train Monday night is now being investigated in connection with a suspicious fire at City Hall a few days earlier, authorities said.

The 45-year-old assailant, whose name has not been released, remains in custody for allegedly dousing a 26-year-old commuter with an accelerant and setting her ablaze after the pair got in a heated argument while aboard a CTA train.

Authorities are investigating whether a fire attack on a Chicago Transit Authority train on Monday was committed by the same person who set a blaze at City Hall a few days earlier. Bloomberg via Getty Images

The unidentified victim remains in critical condition at Stroger Hospital.

In an alarming twist, cops are now looking into whether the same fire

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