Officials of the Department of Petroleum Resources have promised to sustain their enforcement of the Federal Government directive on the approved pump price of petrol in Rivers State.The Port Harcourt Zonal Controller of DPR gave the assurance during a media briefing in the Rivers State capital.NJOKU said the DPR was ready to clampdown on any petrol filling station owner that goes against the government directive.She also warned against removing of the DPR official stickers on sealed petrol filling stations.Our correspondent LEVI ISU reports that the DPR Zonal Controller briefed newsmen after a meeting that had in attendance some representatives of the labour unions in the oil and gas industry.