Japan and the United States failed to make progress on resolving their Trans-Pacific Partnership differences in ministerial talks Saturday as the thorny farm produce and auto trade issues kept the trade pact in limbo.

Both will "continue to work" on narrowing the gaps ahead of a plenary meeting in Singapore, TPP minister Akira Amari told reporters after meeting with U.S. Trade Representative Michael Froman in Washington.

Amari said talks with the United States on the TPP had been "deadlocked" since top officials from both governments met on the sidelines of the World Economic Forum in Davos, Switzerland, last month.