A signing ceremony for a memorandum of understanding with Iran would most likely be held in Geneva, Switzerland, three sources have told CNN.

Two sources with knowledge of the diplomatic talks said the signing ceremony would be held in Geneva — not far from where US President Donald Trump and a US delegation will attend a G7 summit next week in France. One of those sources said a signing ceremony would mark the start of “phase two” of diplomatic talks, as officials work through the implementation of the memo of understanding.

Multiple sources said the memo is being called the “Islamabad declaration,” in recognition of the key mediating role Pakistan played. But nothing has been confirmed, and an Iranian source suggested the Austrian capital Vienna, was also being considered.