Hong Kong tensions rattle world stock markets, oil tumbles

NEW YORK/LONDON (Reuters) - Oil prices tumbled and global equity markets fell on Friday as China's move to impose a new security law on Hong Kong further strained U.S.-China relations and clouded economic recovery prospects.China also dropped its annual growth target for the first time, adding to uncertainty about the fallout from the COVID-19 pandemic, boosting safe-haven investments such as U.S. Treasuries and the dollar.China said it would impose new national security legislation on Hong..