Wikileaks תחשוף בקרוב תכתובות לא רשימיות בין דיפלומטים אמריקאים לשגרירויות שלהם וכן גם ישראל במסמכים.
Wikileaks said the newest release will be seven times the size of the October publication of 400,000 Iraq war documents, the biggest leak to date in US intelligence history.
The site also published 77,000 classified US files on the Afghan conflict in July.
'Diplomatic catastrophe'
According to Der Spiegel, which was granted early access to the files, the release will contain more than 250,000 cables and 8,000 diplomatic directives – mostly from the last five years.
The German newsmagazine has taken down its article summarising the data dumpafter publishing it briefly online.
In addition to Der Spiegel, The New York Times, The Guardian, Le Monde and El País are said to have been allowed to review the files beforehand.
According to White House sources cited by a correspondent of the US website Politico, none of the documents are classified as 'Top Secret'. But reportedly six per cent are listed as 'Secret' and 40 per cent as "confidential".
Al Jazeera's Mike Hanna, reporting from Washington, said the leaks are from correspondence "between US diplomats and between US embassies … not what is said about enemies, but about [US] friends".
He said the files could include particularly sensitive information previously "well out of the public view" about US diplomats' perceptions of crises in Israel and Palestine.
Hanna said that US officials have emphasised how national security – not just public embarrassment – is at stake in the WikiLeaks release.