U.S. Department of Defense launched the investigation into a possible information leak about the U.S. nuclear arsenal in Europe. John Kirby, the Pentagon press secretary said so as quoted by Deutsche Welle.
"The Department of the Air Force is investigating the suitability of information shared via study flashcards… All US weapons are safe and secure", the official claimed.
According to him, the Pentagon will "neither confirm nor deny the presence or absence of nuclear weapons at any specific location". Eurasian Times cited Kirby as he said this.
Earlier, in late May, Bellingcat published the materials, according to which, "the US soldiers designated to guard nuclear weapons in Europe used publicly visible flashcard applications and accidentally exposed several crucial security protocols about the US nuclear weapons and their location". The investigation bureau reiterated that though the US nuclear arsenal's presence in Europe is a known fact (because of information leaks), the particular location of these weapons is classified, and the government does not officially confirm that fact.
According to Bellingcat, the study flashcards used by Air Force servicemen could contain the data about military bases, nuclear weapon storages, as well as protocols with the mention about locations of surveillance cameras, patrol frequencies, passwords designed to alarm the staff about a threat, and the unique identificators.
When Bellingcat sent the request to the NATO and the US Army, the flash cards disappeared from public access.