I am President/Road Commissioner of our Statutory Road Association. I am responsible for safekeeping of association records and insurance documents. I am now looking at our policy from Liberty Mutual Insurance. We have a General Liability Section for "bodily injury and property damage" that should apply to situations like yours.
The first page entitled "Property Holder Information" gives, at the top, the name of the insured and the mailing address and phone number of our local Agent. A bold reminder gives the directive:
In case of a claim, call your Agent or (a company number).
I suggest you have the person responsible contact your agent or insurance company to help guide you through the claim reporting process. I would not contact the claimant further until talking with your agent.