Oil down 5 percent; biggest drop since Feb on Brexit, supply builds

By Barani Krishnan NEW YORK (Reuters) - Oil prices tumbled 5 percent on Tuesday, with U.S. crude heading for its steepest daily decline in five months, as investors worried that Britain's exit from the European Union would slow the global economy, making it unlikely energy demand will grow enough to cut a supply glut. Brent crude was down $2.44, or nearly 4.9 percent, at $47.66 a barrel by 1:09 p.m. EDT (1709 GMT). "There are risk-off trades across the board," said David Thompson, executive vice