Officials said Tuesday they have not seen any easing of China's de facto ban on exports of rare earth minerals — crucial for advanced manufacturing — despite the thaw in tensions over the Senkaku dispute

China has denied that it has halted exports of the materials, but Japanese companies have said shipments of rare earth elements have virtually stopped since around Sept. 21, held up at Chinese ports by increased paperwork and inspections.

"The reality is, the situation has not at all returned to normal," Minister of Economy, Trade and Industry Akihiro Ohata said.