TOKYO Oil prices slumped in early Asian trading after voting ended in a British referendum on whether to stay in the European Union, with early returns showing the "Leave" camp holding the lead.
U.S. crude was down $1.54 at $48.58 a barrel at around 0117 GMT (9:17 p.m. ET). Brent crude was down $1.47 at $49.44 a barrel. Both fell more than $2 a barrel at one point.
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