Commodities were swept up in global market turmoil as investors sold off growth-related assets including oil and copper and sought haven in precious metals as UK voters opted to leave the European Union after more than four decades. The Bloomberg Commodities Index fell as much as 2%, the most in more than a month, as Brent crude futures slumped 6.6% and copper in London tumbled 4%. Gold rose the most in almost 8 years and silver rallied in its biggest intraday gain in 18 months. BBC projections showed voters backing “Leave” by 52% to 48% as of 5:11 a.m. London time, in a surprising rejection of Europe’s postwar political and economic order.