Estimates of food aid needs in Zimbabwe should be revised as maize prices have climbed well above anticipated levels, the Famine Early Warning Systems Network (FEWS NET) has warned. "Due to much higher than expected maize prices, and no evidence of commensurate increases in rural incomes, the rural population in need of food aid is almost certainly higher than that originally estimated by the ZimVAC [Zimbabwe Vulnerability Assessment Committee] in May 2004," FEWS NET said in its latest food security report.