Brent crude futures were down 51 cents, or 0.7 percent, at $76.38 a barrel by 0331 GMT. The global benchmark is on course for a weekly loss of over 4 percent.
Singapore, a global trading hub and financial center, is seen as a bellwether for the global economy because its exports equate to around 200 percent of its output.
Conspiracy theorists strongly believe that the gigantic cloud over Mars might have been artificially created to hide the sinister activities on the Red Planet's surface
The new targets come as geopolitical jitters and trade tensions have put pressure on its main business, with its wealth management division suffering from clients trading less.
More than two dozen top officials and executives from the United States and Europe boycotted the investment conference over the killing of Khashoggi inside the Saudi consulate.