ISLAMABAD: The prices of petroleum products are likely to be decreased by Rs 12 per liter.Sources said as per working made so far prices of petrol, diesel and kerosene oil are likely to be curtailed.The reduction in price of petrol is expected over Rs 9 per liter. The price of diesel is likely to be curtailed by Rs 8.50 per liter.According to sources the price of kerosene oil is likely to be curtailed over Rs 12 per liter.The final working regarding reduction in price of petroleum products will be sent by OGRA on August 15.Finance minister will announce new prices in consultation with Prime Minister.