Mumbai, May 30 -- Oil prices remained under pressure, with WTI futures falling below the key $90 per barrel mark amid reports of a possible extension of the US-Iran ceasefire and renewed negotiations over Iran's nuclear program. WTI crude dropped to a six-week low near $86 per barrel and recorded a loss of nearly 9% for the week as easing geopolitical tensions reduced concerns over supply disruptions through the Strait of Hormuz. Markets will turn their attention to the US storage levels in near term and could possibly offer support to oil. Crude oil inventories in the United States decreased by 3.3 million barrels during the week ending May 22, according to new data from the U.S. Energy Information Administration (EIA) released on Thursday...