A Nigerian oil labour union has begun a nationwide strike, hitting petrol stations and oil tankers, while oil industry workers have shut down seven crude flow stations in the Niger Delta, a union official said yesterday.

The strike is in protest over pay and job losses. The Nigeria Union of Petroleum and Natural Gas Workers (Nupeng) is one of several labour unions that have criticised oil companies for sacking workers in the last few months.

"Filling stations, petrol tankers and all Nupeng members are involved," Cogent Ojobo, the union's Warri zonal chairman, said.

Nupeng has said the strike would last for three days and involve around 10000 workers.

Ojobo said that union officials would hold talks with the labour minister in the capital, Abuja, later yesterday.

"If the issues at stake are resolved and a communiqué is signed, the strike would be called off," he said.

He also said that workers had gone on strike at seven crude oil flow stations in and around Oleh, a town in Delta state, which is in the Niger Delta.

"Seven flow stations belonging to NPDC were shut by the workers and they are still shut now," Ojobo said. He also said the workers, who are employed by contractors, said they had not been paid.

The labour ministry spokesman was not immediately available to comment.

Nigeria has been hit hard by a slump in crude oil prices in the past two years, which helped to push the country into recession. A wave of militant attacks in the southern Niger Delta oil hub throughout 2016 has hampered production.

Ndu Ughamadu, a spokesman for Nigerian Petroleum Development Company, a subsidiary of the state-run oil company, said checks were being made to establish whether the Niger Delta flow stations had been affected.

Last week, Nupeng held a strike at Total's fuel depots in a protest over sackings, but it was suspended after one day after an agreement was reached. No details have emerged about the deal.