KARIMNAGAR: Collector M V Satyanarayana has warned the Liquefied Petroleum Gas (LPG) dealers of stern action if they hoard and sell domestic gas cylinders in black market. Interacting in the weekly Dial your Collector programme on Monday, he told the gas dealers to supply cylinders according to norms, after booking by the customers. He instructed the district supply officer to take necessary action to ensure proper distribution of LPG cylinders..-Staff Reporter