• Secret deal places no legal limits on use of data by Israelis
• Only official US government communications protected
• Agency insists it complies with rules governing privacy
• Read the NSA and Israel's 'memorandum of understanding'

The National Security Agency routinely shares raw intelligence data with Israel without first sifting it to remove information about US citizens, a top-secret document provided to the Guardian by whistleblower Edward Snowden reveals.

Details of the intelligence-sharing agreement are laid out in a memorandum of understanding between the NSA and its Israeli counterpart that shows the US government handed over intercepted communications likely to contain phone calls and emails of American citizens. The agreement places no legally binding limits on the use of the data by the Israelis.

The disclosure that the NSA agreed to provide raw intelligence data to a foreign country contrasts with assurances from the Obama administration that there are rigorous safeguards to protect the privacy of US citizens caught in the dragnet. The intelligence community calls this process "minimization", but the memorandum makes clear that the information shared with the Israelis would be in its pre-minimized state.

The deal was reached in principle in March 2009, according to the undated memorandum, which lays out the ground rules for the intelligence sharing.

The five-page memorandum, termed an agreement between the US and Israeli intelligence agencies "pertaining to the protection of US persons", repeatedly stresses the constitutional rights of Americans to privacy and the need for Israeli intelligence staff to respect these rights.

But this is undermined by the disclosure that Israel is allowed to receive "raw Sigint" – signal intelligence. The memorandum says: "Raw Sigint includes, but is not limited to, unevaluated and unminimized transcripts, gists, facsimiles, telex, voice and Digital Network Intelligence metadata and content."

According to the agreement, the intelligence being shared would not be filtered in advance by NSA analysts to remove US communications. "NSA routinely sends ISNU [the Israeli Sigint National Unit] minimized and unminimized raw collection", it says.

Although the memorandum is explicit in saying the material had to be handled in accordance with US law, and that the Israelis agreed not to deliberately target Americans identified in the data, these rules are not backed up by legal obligations.

"This agreement is not intended to create any legally enforceable rights and shall not be construed to be either an international agreement or a legally binding instrument according to international law," the document says.

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