Which preposition to use with mortuary

at Occurrences 4%

The police have taken him to the mortuary at Dumfries, and the detectives are up there now looking at the spot, they say.

in Occurrences 2%

So that, on considering the two clauses, we see that the wishes of the testator could only be carried out in the unlikely event of his dying in one of the burial-places mentioned, or his body being conveyed immediately after death to a public mortuary in one of the said parishes.

before Occurrences 1%

In the woman lying there in a public mortuary before him, Mr. Hazeldene had recognized his wife.

Which preposition to use with  mortuary