Oil tumbles as Trump leads U.S. election in potential Brexit deja vu

By Henning Gloystein SINGAPORE (Reuters) - Oil prices tumbled on Wednesday as vote counting showed Donald Trump edging ahead in an unexpectedly tight U.S. presidential election, throwing world markets into turmoil in a result reminiscent of June's Brexit vote. Crude futures markets roared into action, with trading accelerating as Europe joined Asia from around 0500 GMT, as Trump surprised by defeating Democrat Hillary Clinton in a series of key contests and opening a path to the White House. U.S