YENAGOA, Nigeria (Reuters) - A major Nigerian oil union has suspended planned industrial action after 21 Exxon Mobil Corp. employees quarantined last week after their arrest for violating coronavirus-related movement restrictions were freed, it said on Sunday.

FILE PHOTO: An aerial view shows waterways in the city of Port Harcourt, in Rivers State, Nigeria June 19, 2017. Picture taken June 19, 2017. REUTERS/Paul Carsten/File Photo

The governor of southern oil hub Rivers State, Nyesom Wike, on Friday said Exxon Mobil workers were arrested after entering the state from neighbouring Akwa Ibom State in violation of an executive order restricting movement into the state as part of measures imposed last month.

He said 22 workers, whose coronavirus status was unknown, were quarantined in line with relevant health protocols and would be charged in court.

But Wike’s spokesman, Simeon Nwakaudu, on Sunday issued a statement that said the workers were all released without charge “following interventions by well-meaning Nigerians”.

The union said its statement referred to 21 Exxon Mobil workers who were union members, whereas Rivers State included the driver in its tally to total 22 people.

Exxon Mobil declined to comment on the situation.

The Petroleum and Natural Gas Senior Staff Association of Nigeria (PENGASSAN) said it had instructed its members to withdraw all forms of services relating to crude oil production, refining, distribution and supplies from Monday unless the Exxon Mobil workers were freed.

“Having achieved the primary demand in our ultimatum, we hereby suspend the planned industrial action,” PENGASSAN said in a statement on Sunday.

Port Harcourt, capital of Rivers State, is the hub of the oil industry in Africa’s biggest producer of crude. Sales of crude oil make up about 90% of Nigeria’s foreign exchange earnings.

Rivers State has recorded two cases of coronavirus so far. Nigeria has 541 confirmed cases nationwide and 19 deaths. The most high profile victim was the president’s chief of staff, Abba Kyari, who died on Friday.

Nigeria’s petroleum regulator has ordered oil and gas companies to reduce their offshore workforce and move to 28-day staff rotations, instead of the usual 14 days, to help to curb the spread of the new coronavirus.

PENGASSAN, in its statement, called on the government to “guarantee unfettered movement of oil and gas workers on essential services in all territories of the federation” so they could continue to provide services.