Oil prices rose on Thursday as supply risks overshadowed a weaker demand outlook. Brent crude for October delivery gained 1.01% to $88.09 a barrel, while U.S. West Texas Intermediate for September advanced 1.15% to $82.31 per barrel. The market was supported by a spreading oil spill off Oman from a tanker that ran aground on June 30 carrying an estimated 800,000 barrels of Russian oil and is under international sanctions, as well as deadly attacks on vessels in the Gulf of Oman and the Red Sea. The International Energy Agency said global oil demand is set to fall further than previously expected this year because the closure of the Strait of Hormuz (a key Gulf oil shipping route) is having a deeper impact. At the same time, the agency said "renewed hostilities and maritime disruptions" are hampering efforts to raise supply, with output still 6.3 million barrels a day lower than a year earlier in July. Analysts said uncertainty over any full reopening of the waterway could keep prices biased higher while the market remains tight.