Oil tumbles on oversupply concerns, sinking world stocks

NEW YORK (Reuters) - Oil prices plunged on Friday on concerns about oversupply, sending world stock markets lower as lagging energy shares weighed down Wall Street.Both Brent and U.S. crude fell to their lowest levels since October 2017 and were on course for their biggest one-month decline since late 2014. Although the Organization of the Petroleum Exporting Countries is expected to curb output, rising U.S. oil supply has fuelled persistent concerns about a global surplus.Tumbling oil prices..