ISLAMABAD - A writ petition against increase in prices of compressed natural gas (CNG) was filed at Islamabad High Court here on Thursday. Ashfaque Mohammad Chaudhry under Article 199 of the Constitution filed the writ petition. The petitioner pleaded that CNG was a local produce and increase in its prices was causing great unrest among the people who had already been overburdened with spiralling price hike of various commodities. He prayed to Court to direct govt to bring down its prices immediately.