Oil prices fell below 105 dollars Friday on concerns over slowing energy demand and a strong US currency, while the market awaited next week's OPEC meeting on crude output levels, traders said. Brent North Sea crude for delivery in October dropped 1.45 dollars to 104.85 dollars a barrel in electronic deals. New York's main contract, light sweet crude for October, fell 1.49 dollars to 106.40 dollars a barrel.