The building is currently closed for building work.
A spokesperson for North Yorkshire Police said: “We are requesting the public’s assistance to help establish the full circumstances surrounding the incident.”
Anyone who saw anything suspicious at the time of the incident, or who has information that could assist the investigation is asked to email james.bowie@northyorkshire.police.uk.
You can also call North Yorkshire Police on 101, select option 2, and ask to speak to PC James Bowie.
If you wish to remain anonymous, you can pass information to Crimestoppers on 0800 555 111.
Please quote the North Yorkshire Police reference number 12220169889.
