As traders bought contracts amid some expectation that the market may have bottomed out along with persistent concerns about oil supplies from Iran and Nigeria, crude oil prices rebounded slightly. Light, sweet crude for June delivery climbed to US$68.69 a barrel in Asian electronic trading on the New York Mercantile Exchange. Oil prices fell in the previous session by a general sell-off in the commodities market, sparked by a rise in the U.S. dollar after several days of declines, and worries over rising U.S. inflation.