The intelligence services of Israel have allegedly been spying on American officials during their closed-door negotiations with the government of Iran over its nuclear program. The Wall Street Journal said the spy operation forms part of a broader campaign by Tel Aviv to sabotage the talks, which are aimed at bridging the differences between the Islamic Republic and a group of nations that have come to be known as P5+1, representing the five permanent members of the United Nations Security Council plus Germany.

In a leading article published on Monday, the paper said it decided to reveal the existence of the Israeli spying program after interviewing “more than a dozen current and former US and Israeli diplomats, intelligence officials, policy makers and lawmakers”. Ironically, according to The Journal, the administration of US President Barack Obama found out about the Israeli spying after instructing American intelligence agencies to conduct a counterintelligence operation against Tel Aviv, in order to see what they knew about the secret negotiations with Iran. After spying on Israeli government officials, the American agencies concluded that they were in possession of confidential information that could only have been acquired from spying on participants in the negotiations.

According to The Journal, American officials were not surprised by the spying. But they were especially perturbed, said the paper, to find out that the Israeli government proceeded to leak the secret information to American lawmakers opposed to a possible deal with Iran, in order “to undermine US diplomacy”, according to one unnamed senior American official.

Israeli officials told The Journal that Tel Aviv had indeed acquired confidential information about the negotiations, but that they had done so by spying on Iranian, not American, negotiators. Speaking late on Monday, a spokesman for the office of the Israeli Prime Minister Benjamin Netanyahu said the American newspaper’s allegations were “utterly false. The state of Israel does not conduct espionage against the United States or Israel’s other allies”, he said, adding that the “false allegations” were “clearly intended to undermine the strong ties between the United States and Israel”.