US, EU and Japan challenge China on rare earths at WTO
The US, Japan and the European Union have filed a case against China at the World Trade Organization, challenging its restrictions on rare earth exports.
US President Barack Obama announced the filing at the White House, accusing China of breaking agreed WTO rules.
Beijing has set quotas for exports of rare earths, which are critical to the manufacture of high-tech products from hybrid cars, to flat-screen TVs.
The BBC's Mike Wooldridge reports.