Amid growing concern about gun violence in the U.S., one insurer has seen increased interest in a policy covering shootings at companies. Insurance broker Willis started selling so-called active shooter insurance three months ago, and has received inquiries from hotels and hospitals, among other possible buyers, according to Fortune. A Willis spokeswoman confirmed to CNBC on Friday that it offers the policies, but did not immediately give more details.

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Gun violence has become a larger concern for companies amid a string of mass shootings this year. The latest came Wednesday, when attackers opened fire at a holiday party in San Bernardino, California, killing 14 people. The insurance policy covers potential liability if an institution is deemed not to have taken the steps needed to prevent gun violence, according to Fortune. Beazley, which manages syndicates of British insurance market Lloyd's, is currently the only underwriter of the policy.