Business Day | Concern about disruptions supports oil Business Day Singapore — Oil prices rose on Tuesday as risks of supply disruptions from Venezuela, Libya, Nigeria and Iran triggered the expectation of a tightening market. International Brent crude oil futures were at $76.37 a barrel at 2.15am GMT, up 16c, or 0.2 ... Oil rises on expectations of tightening market Oil markets dip amid mixed price signals Oil markets trading in range amid mixed supply signals |