Eurozone officials are working to magnify the firepower of the region’s rescue fund, European Central Bank policymakers have said, while US President Barack Obama piled on pressure for Europe to staunch a sovereign debt crisis that threatens the world economy. After meeting at the IMF/World Bank and G20 meetings in Washington DC last week, European policymakers said on Monday they are working on ways to shore up the eurozone financial system and prevent the region’s government debt crisis from spreading. However,