Petroleum and Natural Gas Senior Staff Association of Nigeria, on Sunday, shut down the Dangote Refinery plant.
PENGASSAN disclosed this in an update on its strike action against Dangote Refinery over the alleged sacking of over 800 workers who joined the union.
It said its members have shut all oil installations nationwide.
PENGASSAN noted that the refinery plant is 100 per cent shut down; fertiliser plant train two is also 100 per cent shut, with train one running at 60 per cent capacity.
It added that the diesel plant is still running at the moment.
But Dangote Refinery has yet to confirm the development.
The implication is that crude and gas supply to the refinery have been disrupted.
Recall that in a statement on Saturday, Dangote Refinery described the PENGASSAN directive as economic sabotage.
The Nigerian Upstream Petroleum Regulatory Commission on Sunday urged Dangote Refinery and PENGASSAN to engage in dialogue to resolve the rift.
The dispute between Dangote Refinery and PENGASSAN started after the former sacked over 800 workers for belonging to the union.

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