Rice prices have scaled fresh heights in Asian trade amid concern that export bans by key producers will hit demand.Rough rice for July delivery touched $24.745 per 100lb for the first time, before falling slightly.
Curbs are in place in India and Vietnam to protect domestic supply and there are fears that Thailand, the world's largest producer, could follow suit.
The global food crisis is a "silent tsunami" with an extra 100 million people facing poverty, the UN said.
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