Finance officials from rich and developing countries pledged to boost the role of the International Monetary Fund and make a "sustained effort" to restore global growth after a key conference that sought to bridge deep divisions on how to tackle the financial crisis. The key priority must be restoring frozen bank lending through cash infusions and dealing with the shaky assets souring bank's balance sheets, the finance ministers and central bankers from the Group of 20 countries said in a statement at the end of talks in southern England. The statement did not back a US push for concrete, coordinated efforts for governments to spend more money to boost their economies. It acknowledged the importance of the stimulus efforts already in place, and called for stronger financial regulation. But it left details on that and other topics undefined ahead of a much-anticipated summit of their heads of state and governments in London on April 2. Downplaying signs of division between Europe and the United States, the group agreed that there was an "urgent need to increase IMF resources very substantially," although they did not commit to a figure, leaving that task to the upcoming summit. They also agreed on the need for regulatory oversight and registration of credit-rating agencies, widely blamed for fomenting the crisis by giving strong ratings to risky securities. "We're prepared to take whatever action is necessary to ensure growth is restored and we're committed to do that for however long it takes to do that," British Treasury chief Alistair Darling, who played broker between Europe and the United States, said. US Treasury Secretary Timothy Geithner, who had pushed for Europe to match Washington's $787 billion package of spending and tax cuts, said there was "broad consensus globally on the need to act aggressively to restore growth to the global economy." Geithner said he was pleased with progress made at the talks on Friday and Saturday, but noted that the crisis was still playing out. "This is a very challenging period and this is still evolving," he told reporters. Darling also said that the G-20 had agreed to a clampdown on the supervision and regulation of hedge funds. "We agreed that stronger regulation... was necessary to prevent the build-up of systemic risk," he said. The group also committed to fighting protectionism and pledged to help emerging and developing economies to cope with the loss of international capital flows, an issue that they have raised repeatedly. The four major emerging economies represented at the meeting - Brazil, Russia, India and China - had earlier released their own joint communique, calling for a bigger role in the International Monetary Fund. The final summit statement agreed that IMF governance needs to reflect the changed global economy and the growing role of developing countries. The quartet also called on the United States and Europe to improve information sharing and policy coordination to "ensure that macroeconomic policy is more balanced, proactive, coordinated and countercyclical." The wider G-20, representing countries that account for more than 80 percent of the world economy, have been in conflict over over whether to use fiscal stimulus - big spending packages and tax cuts - or better regulation to drag the world economy out of its slump. The run-up to the gathering in a luxury hotel south of the British capital was marked by a trans-Atlantic dispute, with pointed comments from Washington that Europe was not doing enough fiscal stimulus. The International Monetary Fund estimates that only Saudi Arabia, Australia, China, Spain and the US will introduce budget boosts worth 2% of gross domestic product this year, the level that Geithner considers "reasonable." European nations claim that increased spending on social welfare and unemployment is a form of stimulus that will support the economy - and makes the total EU rescue package higher than the US program. German Chancellor Angela Merkel kept the battle lines drawn on Saturday after meeting separately with British Prime Minister Gordon Brown, rejecting those calls and saying that action in Berlin, London and other European capitals had barely had time to produce results. The debate had led many to fear that the gathering of finance chiefs will fail in its task set a common agenda on key issues for a full summit of G-20 heads of state and government on April 2, a major concern as black economic clouds continue to roll in. The World Bank warned last week that the global economy will shrink this year for the first time since World War II, and the United States reported on Friday that its trade deficit plunged in January to the lowest level in six years as the economic downturn cut America's demand for imported goods, dashing hopes of a US-led recovery. China, meanwhile, has been battered by a plunge in global demand for its goods, with exports falling 25.7% in February. With so much at stake, Britain has been trying to act as a broker between European countries and the United States, pushing for a rescue package that includes both economic stimulus and regulatory reform.