U.S. Secretary of State Marco Rubio said on Monday that a rare direct meeting between a U.S. envoy and the Palestinian terrorist group Hamas was an isolated event and has yet to yield results.

“That was a one-off situation in which our special envoy for hostages, whose job it is to get people released, had an opportunity to talk directly to someone who has control over these people and was given permission and encouraged to do so. He did so,” Rubio told reporters while traveling to Saudi Arabia, according to Reuters.

Furthermore, the meeting between U.S. President Donald Trump’s hostage envoy Adam Boehler and Hamas had not led to tangible outcomes, said Rubio.