Any horror movies like this?

I asked about this on the I Need to Know board but so far nobody knows anything, thought I'd have better luck here.

I don't think there's any shortage of horror movies featuring psycho/killer cops, or at least killers pretending to be cops, but are there any horror movies where the killer is a fireman or at least dressed like one and uses the equipment to murder his victims?

Arson is boring, arson is typical, watching Chicago Fire I really started to appreciate all the tools they use that a killer could use to his advantage, axes, picks, Halligan bars, power saws, etc. If it's not a thing and hasn't been done in movies yet, it totally should be, it's chock full of potential. But if it really hasn't been done yet, I'll be very surprised because it just seems such an obvious route to take.