TOYAKO (AFP) - The Group of Eight powers Tuesday called on nations with sufficient food stocks to release some of their reserves to countries in need to help cope with soaring prices. The G8 nations said in a statement on food security it was "imperative to remove export restrictions" that hinder humanitarian purchases of food. "We also call for countries with sufficient food stocks to make available a part of their surplus for countries in need, in times of significantly increasing prices and in a way not to distort trade," they added. The G8 nations - Britain, Canada, France, Germany, Italy, Japan, Russia and the United States - said they were "deeply concerned" about soaring food prices and supply shortages in some developing countries. Rising food prices have pushed 100 million people below the poverty line, the World Bank estimates, and have sparked protests and even riots in some parts of the world. "The negative impacts of this recent trend could push millions more back into poverty," the G8 said in a statement on food security. The G8 said they were "determined to take all possible measures" to ease the food crisis, noting that they had committed more than 10 billion dollars since January to support food aid and other remedial measures. The G8 said they would "explore options on a coordinated approach on stock management," following a proposal to set up a system of emergency food reserves much like oil stockpiles. They said measures were also needed to boost world food production and investment in agriculture. The leaders pledged to work to ensure the use of biofuels does not affect food security, vowing to accelerate the development of second-generation biofuels produced from the inedible parts of plants. Biofuels, derived from organic materials such as palm oil and sugar beet, were once seen as a promising way to reduce greenhouse gas emissions blamed for global warming by cutting the use of fossil fuels. But some experts have warned recently that current biofuels policy could push up grain prices and cause greenhouse gas emissions rather than savings.