The labour crisis between the Dangote Petroleum Refinery and the Petroleum and Natural Gas Senior Staff Association of Nigeria (PENGASSAN) escalated sharply on Saturday as the union ordered its branches to halt crude oil and gas supply to the $20 billion facility. “As you are aware, the Management of Dangote Petroleum Refinery has disengaged our members in reaction to the exercise of their constitutional right to being unionized. “Consequent to these, you are hereby directed to cut off gas supply to NGIC effective immediately. All crude oil supply valves to the Refinery should be shut. Responding on Friday, Dangote Refinery denied allegations of mass layoffs.