Oil prices dropped yesterday on easing West Asia supply concerns and after a spike caused by the US Federal Reserve's surprise decision to maintain its aggressive stimulus programme. Brent North Sea crude for delivery in November slid 1.59 US Dollars to stand at 109.01 Dollars a barrel in late London deals. New York's main contract, West Texas Intermediate for October shed 1.04 Dollars to 107.03 Dollars. Oil prices had shot higher in recent weeks also on fears that a US-led attack on Syria could affect West Asia crude supplies to the West.