Four of the countries negotiating the Trans-Pacific Partnership initiative are offering the other members total tariff elimination on all agricultural and industrial goods, a source close to the talks said.

The move by Australia, New Zealand, Singapore and Chile is likely to put pressure on Japan, the second-largest of the 12 TPP economies, to open up its politically sensitive agricultural market, the source said Friday.

The other members of the free trade talks were expected to reveal their offers later Saturday, the fourth and final day of the lead negotiators' meeting in Washington, the source said.