The White House has issued a statement saying the U.S. announced a China trade deal after the conclusion of talks between the U.S. and Chinese delegations in Switzerland on Sunday. But it wasn't immediately clear whether a deal had actually materialized.

China hailed a trade agreement with the U.S. that will see both sides sharply reduce their tariffs for 90 days, calling it an "important step" that could lead to "deepening cooperation" between the world's two largest economies.