The Polish Geological Institute has just shared an article about the recent find in Poland - here you have an article in Polish, but worth looking at because of some pictures from the site and the images of the specimen http://www.pgi.gov.pl/aktualnosci/display/10405-wielki-drapieznik-z-gor-swietokrzyskich.html and here is the official paper regarding the discovery http://www.kirj.ee/public/Estonian_Journal_of_Earth_Sciences/2018/issue_1/earth-2018-1-33-42.pdf