The official did not name who was involved in the effort, but said the "limited bilateral discussions" took place in September, October and November.

US Secretary of State John Kerry, who joined the final negotiations in Geneva, said the pact will make US allies in the Middle East, including Israel, safer by reducing the threat of war.

"Agreement in Geneva," he tweeted. "First step makes world safer. More work now."

About the broadcaster:

Lance Crayon is a videographer and editor with China Daily. Since living in Beijing he has worked for China Radio International (CRI) and Global Times. Before moving to China he worked in the film industry in Los Angeles as a talent agent and producer. He has a B.A. in English from the University of Texas at Arlington.

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