Sensitive Israeli documents obtained by Tehran should be unveiled soon, Minister of Intelligence Esmail Khatib told state TV on Sunday, describing them as a "treasure trove" which will strengthen Iran's offensive capabilities.

Iranian state media reported on Saturday that Iranian intelligence agencies had obtained a large trove of sensitive Israeli documents. Khatib said these were related to Israel's nuclear facilities and its relations with the United States, Europe and other countries, and to its defensive capabilities.

There was no immediate official comment from Israel.

It was not clear whether the information breach was linked to a reported hacking of an Israeli nuclear research centre last year which Tehran is only disclosing now amid heightened tensions over its nuclear programme.

"The transfer of this treasure trove was time-consuming and required security measures. Naturally, the transfer methods will remain confidential but the documents should be unveiled soon," Khatib said, adding that in terms of volume, "talking of thousands of documents would be an understatement."

In 2018, Israeli Prime Minister Benjamin Netanyahu said that Israeli agents had seized a huge "archive" of Iranian documents that showed Tehran had done more nuclear work than previously known.

US President Donald Trump has threatened to bomb Iran if Tehran did not come to an agreement with Washington over its nuclear programme. But Trump in April reportedly blocked a planned Israeli strike on Iranian nuclear sites in favour of negotiating a deal with Tehran.

Supreme Leader Ayatollah Ali Khamenei said on Wednesday that abandoning uranium enrichment was “100 percent” against Iran's interests, rejecting a central US demand in talks to resolve a decades-long dispute over Tehran's nuclear ambitions.

Western powers say Iran is refining uranium to a high degree of fissile purity close to the level suitable for atomic bomb fuel. Iran has long denied seeking nuclear weapons.