Crude oil prices extended losses in Asian trade, today, on worries of weak demand in the US, the world's biggest energy consumer. New York's main contract, light sweet crude for April delivery shed 44 cents, to 80.80 dollars a barrel. The benchmark futures contract had briefly topped 83 dollars on Friday. Brent North Sea crude for April fell 46 cents, to 78.93 dollars a barrel.Meanwhile, the International Energy Agency raised its forecast for global demand in 2010 on Friday, citing an "astonishing" growth trend of 28 per cent in China as advanced economies emerge from recession.