Russia’s Federal Security Service is reportedly trying to hunt down the Interior Ministry staff members who “sold off” passport and identification documents belonging to Alexander Petrov and Ruslan Boshirov (the two suspected GRU agents accused of trying to assassinate Sergey Skripal and his daughter with a nerve agent in Salisbury, England). A source told the news agency Rosbalt that “serious measures” are planned against whomever was responsible for leaking the two suspects’ personal information.

Earlier this month, the open-source investigative team Bellingcat and the news website The Insider started releasing leaked passport documents issued to Petrov and Boshirov. Both publications, aided by follow-up investigative work by Novaya Gazeta and Fontanka, have demonstrated that the data contained in the paperwork strongly suggest that Petrov and Boshirov are identities assigned to two Russian military intelligence agencies. Russian officials have denied allegations that they had any role in the attempted murder of the Skripals.