According to Spanish media, all the seafarers onboard the vessel were immediately took coronavirus tests, with 7 out of 9 resulted to be positive.
In light of the situation, the Maltese-flagged Samus Swan oil and chemical vessel, owned by Danish Uni-Tankers, has been forced into quarantine at the Isla Verde Exterior dock.
What is more, the region's health authorities have banned the entrance onboard the tanker while its crew is not permitted to leave the vessel until the end of quarantine.
The crewmembers are now waiting the results of retesting by Spanish health authorities.
Following initial results of retesting, two crewmembers were found positive to the virus and were transferred to a hospital for isolation.
Concluding, Spain's foreign health agency has ordered the vessel held pending the completion of quarantine.