The United Arab Emirates is planning to make its first official visit to Israel on Sept. 22 to build up the countries’ agreement to normalize relations, a source familiar with the provisional itinerary said on Monday, Reuters reports.

The source said the UAE was expected to finalize the trip after a date is announced for a ceremony, likely in Washington, where the countries’ leaders will sign their normalization accord. That ceremony is likely to take place in mid-September, the source added.

The two countries announced on Aug. 13 they would normalize diplomatic relations in a U.S.-brokered deal that was hailed as a breakthrough by Washington and Israel but spurned by the Palestinians.