Israeli media reported on Monday that Prime Minister Benjamin Netanyahu flew to Saudi Arabia for a clandestine meeting with Crown Prince Mohammed bin Salman, which would mark the first known encounter between senior Israeli and Saudi officials.

Hebrew-language media cited an unnamed Israeli official as saying that Netanyahu and Yossi Cohen, head of Israel’s Mossad spy agency, flew to the Saudi city of Neom on Sunday, where they met with the crown prince. The prince was there for talks with visiting United Secretary of State Mike Pompeo.

A Gulfstream IV private jet took off just after 1740 GMT from Ben-Gurion International Airport near Tel Aviv, according to data from website FlightRadar24.com. The flight traveled south along the eastern edge of the Sinai Peninsula before turning toward Neom and landing just after 1830 GMT, according to the data. The flight took off from Neom around 2150 GMT and followed the same route back to Tel Aviv.

The Israeli prime minister’s office did not respond to requests for comment.

Pompeo traveled with an American press pool on his trip throughout the Mideast, but left them at the Neom airport when he went into his visit with the crown prince.

While Bahrain, Sudan and the United Arab Emirates have reached deals under the Trump administration to normalise ties with Israel, Saudi Arabia so far has remained out of reach.

King Salman long has supported the Palestinians in their effort to secure an independent state. However, analysts and insiders suggest his 35-year-old son, Crown Prince Mohammed bin Salman, is likely more open to the idea of normalising relations without major progress in the moribund peace process.

The kingdom approved the use of Saudi airspace for Israeli flights to the UAE, a decision announced the day after Jared Kushner, Trump’s son-in-law and senior adviser, met with Prince Mohammed in Riyadh. Bahrain normalising ties also suggests at least a Saudi acquiescence to the idea, as the island kingdom relies on Riyadh.

Israel has long had clandestine ties to Gulf Arab states that have strengthened in recent years as they have confronted a shared threat in Iran.