Edward Snowden to reveal more Israel secrets, says Glenn Greenwald

Former US spy agency contractor Edward Snowden has more secrets to reveal that relate to Israel, the journalist who first brought his leaks to the world's attention said.

Among allegations aired by Snowden last year were that the US National Security Agency and its British counterpart GCHQ had in 2009 targeted an e-mail address listed as belonging to then-Israeli prime minister Ehud Olmert and monitored e-mails of senior defence officials.

Israel played down the disclosures. But Prime Minister Benjamin Netanyahu said he had ordered the matter examined and that "there are things that must not be done" between allies.

Glenn Greenwald, who as a writer for Britain's newspaper met the fugitive Snowden and has written or co-authored many of the newspaper's stories based on his material, was asked in an Israeli television interview whether the ex-contractor had more secrets to tell that related to Israel.

"Yes. I don't want to preview any stories that aren't yet published, but it is definitely the case that there are a huge number of very significant stories that are left to report," said the Brazil-based Greenwald, speaking to Channel Ten TV by video link on Monday.

"We have only had these documents for seven months, which, given their volume and complexity, is not a very long time. There definitely are stories left that involve the Middle East, that involve Israel.