The Group Chief Executive Officer of the Nigerian National Petroleum Company (NNPC) Limited, Mele Kyari, says market forces are responsible for the rising pump prices of Premium Motor Spirit (PMS) known as petrol.

Kyari spoke on Tuesday afternoon after a meeting with Vice President Kashim Shettima at Aso Rock, Abuja.

He said with deregulation of the oil sector, market realities will force the prices of petrol up sometimes and at other times force the prices down but supply will be constant.