BEIJING- China's state planner said on Thursday it will work with other departments to release state reserves of copper, aluminium and zinc at an appropriate time to boost market supply, lower firms' cost pressures and guide prices to a return to normal ranges.

Meng Wei, spokesperson for the National Development and Reform Commission (NDRC), said that they had achieved preliminary results in curbing surges in commodity prices, and the NDRC will step up supervision on spot and futures markets and safeguard normal market order.

(Reporting by Stella Qiu and Gabriel Crossley; Editing by Muralikumar Anantharaman) ((Gabriel.Crossley@thomsonreuters.com; +86 10 5669 2127;))