JOHANNESBURG - Brent crude eased slightly after topping $90 a barrel for the first time in a month. Traders are once again concerned about an escalation of fighting between the United States and Iran and the potential impact on Middle East oil supplies. READ | Brent rally sparks fresh inflation fearsThe conflict has expanded beyond military targets, with bridges, utilities and port facilities also coming under attack. Kuwait Petroleum says Iran struck one of its oil facilities on Saturday. The rally is clouding South Africa's fuel price outlook: motorists now expect only a modest petrol price cut in August, while diesel is expected to rise.