Oil prices fall amid Brexit concerns, supply risks

By Aaron Sheldrick TOKYO (Reuters) - Oil prices fell in Asian trading amid wider market turmoil set off by mounting concerns over the economic impact of Britain's vote to leave the European Union. The contract fell 5 percent to end at $46.60 on Tuesday as U.S. investors digested news of an OPEC increase in production after the July 4 holiday on Monday closed trading. Oil prices are up almost 80 percent from 12-year lows of around $27 for Brent and $26 for U.S. crude in the first quarter and they