Jordan’s king called on Israeli and Palestinian leaders to stick with negotiations Monday, saying the chance for peace would not come again.

King Abdullah II made the statements while meeting with Israeli opposition leader MK Isaac Herzog (Labor) in Amman Monday morning.

“There is a one-time opportunity to reach an agreement in the Middle East, and we must find the formula that doesn’t blow up the negotiations,” the Jordanian leader told Herzog, according to a statement from Herzog’s office.

Herzog emphasized the support of opposition parties, including his own Labor party, for US-brokered peace talks currently underway.

The palace confirmed the meeting, but offered no further details on what was said. It said in a statement, “The king and the head of the Labor Party and member of the Knesset Isaac Herzog discussed efforts to achieve peace between Israel and the Palestinians under the sponsorship of the United States.”

Herzog used the meeting to offer condolences for an incident in early March in which Jordanian-Palestinian judge Raed Zeiter was shot dead by an IDF soldier at the Allenby border crossing between Israel and Jordan. The incident remains under investigation.

“I want to offer my sincere apologies over the incident,” said Herzog, who was reportedly the first Israeli to meet the Jordanian king since the incident. “I hope the joint investigative committee will discover the truth and deliver its conclusions quickly.”

AFP contributed to this report.