KARACHI, April 30: The Oil Companies Advisory Committee (Ocac) has decided to keep prices of all petroleum products unchanged during the fortnight beginning on May 1, says a press release. A PSO spokesperson said the sub-committee of Ocac, which met on Saturday for a fortnightly review of petroleum prices, decided to maintain prices currently in force of petrol, high speed diesel, kerosene oil, light diesel and other produces during the next 15 days.