Aggravated arson consists of the wilful [willful] or malicious damaging by any explosive substance or the wilful [willful] or malicious setting fire to any bridge, aircraft, watercraft, vehicle, pipe line [pipeline], utility line, communication line or structure, railway structure, private or public building, dwelling or other structure, causing a person great bodily harm.
Whoever commits aggravated arson is guilty of a second degree felony.