In an alert sent out to credit unions, CUNA Mutual Insurance recommends prohibiting firearms.
http://prtlimages.cunamutual.com/imageserver/publishedimages/publish/cunamutual_com/catalogs/portlet_folder/public/web_content/products/insurance_protection/risk_alerts/media_files/do_guns_belong_in_the_workplace___media_file__da_1463135__2.pdf
In case they pull this .pdf, I've tried to attach it to this post.
http://prtlimages.cunamutual.com/imageserver/publishedimages/publish/cunamutual_com/catalogs/portlet_folder/public/web_content/products/insurance_protection/risk_alerts/media_files/do_guns_belong_in_the_workplace___media_file__da_1463135__2.pdf
In case they pull this .pdf, I've tried to attach it to this post.