Health inspectors in Greece carrying out additional COVID-19 tests Tuesday on the crew of a cruise ship carrying more than 1,500 people after the vessel was ordered to a testing area at the country's largest port, near Athens.

The Maltese-flagged Mein Schiff 6, which is on a Greek island cruise, was docked Tuesday at the port of Piraeus after sample testing of the crew found 12 ship staff positive but asymptomatic, Greek authorities said.

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A medic gets out of an ambulance parked near the Mein Schiff 6 cruise ship as the ship is docked at Piraeus port, near Athens on Tuesday, Sept. 29, 2020. Greek authorities say 12 crew members on a Maltese-flagged cruise ship carrying more than 1,500 people on a Greek islands tour have tested positive for coronavirus and have been isolated on board. (AP PhotoPetros Giannakouris)

Health inspectors in Greece carrying out additional COVID-19 tests Tuesday on the crew of a cruise ship carrying more than 1,500 people after the vessel was ordered to a testing area at the country's largest port, near Athens.

A man wearing a mask to prevent the spread of the coronavirus looks out of the Mein Schiff 6 cruise ship as it is docked at Piraeus port, near Athens on Tuesday, Sept. 29, 2020. Greek authorities say 12 crew members on a Maltese-flagged cruise ship carrying more than 1,500 people on a Greek islands tour have tested positive for coronavirus and have been isolated on board.(AP PhotoPetros Giannakouris)

Passengers had undergone coronavirus tests before boarding.

Passengers of the Mein Schiff 6 cruise ship wearing a mask to prevent the spread of the coronavirus arrive for a breakfast as the ship is docked at Piraeus port, near Athens on Tuesday, Sept. 29, 2020. Greek authorities say 12 crew members on a Maltese-flagged cruise ship carrying more than 1,500 people on a Greek islands tour have tested positive for coronavirus and have been isolated on board. (AP PhotoPetros Giannakouris)

Passengers of the Mein Schiff 6 cruise ship wearing a mask to prevent the spread of the coronavirus arrive for a breakfast as the ship is docked at Piraeus port, near Athens on Tuesday, Sept. 29, 2020. Greek authorities say 12 crew members on a Maltese-flagged cruise ship carrying more than 1,500 people on a Greek islands tour have tested positive for coronavirus and have been isolated on board. (AP PhotoPetros Giannakouris)

A passengers of the Mein Schiff 6 cruise ship takes pictures with her mobile as the ship is docked at Piraeus port, near Athens on Tuesday, Sept. 29, 2020. Greek authorities say 12 crew members on a Maltese-flagged cruise ship carrying more than 1,500 people on a Greek islands tour have tested positive for coronavirus and have been isolated on board.(AP PhotoPetros Giannakouris)

A passengers of the Mein Schiff 6 cruise ship takes pictures with her mobile as the ship is docked at Piraeus port, near Athens on Tuesday, Sept. 29, 2020. Greek authorities say 12 crew members on a Maltese-flagged cruise ship carrying more than 1,500 people on a Greek islands tour have tested positive for coronavirus and have been isolated on board.(AP PhotoPetros Giannakouris)

Greek healthcare ministry officials enter the Mein Schiff 6 cruise ship as the ship is docked at Piraeus port, near Athens on Tuesday, Sept. 29, 2020. Greek authorities say 12 crew members on a Maltese-flagged cruise ship carrying more than 1,500 people on a Greek islands tour have tested positive for coronavirus and have been isolated on board. (AP PhotoPetros Giannakouris)

Greek healthcare ministry officials enter the Mein Schiff 6 cruise ship as the ship is docked at Piraeus port, near Athens on Tuesday, Sept. 29, 2020. Greek authorities say 12 crew members on a Maltese-flagged cruise ship carrying more than 1,500 people on a Greek islands tour have tested positive for coronavirus and have been isolated on board. (AP PhotoPetros Giannakouris)

A woman wearing a mask to prevent the spread of the COVID-19 looks out of the Mein Schiff 6 cruise ship as it is docked at Piraeus port, near Athens on Tuesday, Sept. 29, 2020. Greek authorities say 12 crew members on a Maltese-flagged cruise ship carrying more than 1,500 people on a Greek islands tour have tested positive for coronavirus and have been isolated on board. (AP PhotoPetros Giannakouris)

A woman wearing a mask to prevent the spread of the COVID-19 looks out of the Mein Schiff 6 cruise ship as it is docked at Piraeus port, near Athens on Tuesday, Sept. 29, 2020. Greek authorities say 12 crew members on a Maltese-flagged cruise ship carrying more than 1,500 people on a Greek islands tour have tested positive for coronavirus and have been isolated on board. (AP PhotoPetros Giannakouris)

Officials from the Health Ministry said results Tuesday from rapid-diagnostic tests given to 150 crew members were all negative, adding that the emergency that halted the cruise would be lifted once the results were confirmed through genetic tests.

A medic gets out of an ambulance parked near the Mein Schiff 6 cruise ship as the ship is docked at Piraeus port, near Athens on Tuesday, Sept. 29, 2020. Greek authorities say 12 crew members on a Maltese-flagged cruise ship carrying more than 1,500 people on a Greek islands tour have tested positive for coronavirus and have been isolated on board. (AP PhotoPetros Giannakouris)

A medic gets out of an ambulance parked near the Mein Schiff 6 cruise ship as the ship is docked at Piraeus port, near Athens on Tuesday, Sept. 29, 2020. Greek authorities say 12 crew members on a Maltese-flagged cruise ship carrying more than 1,500 people on a Greek islands tour have tested positive for coronavirus and have been isolated on board. (AP PhotoPetros Giannakouris)

Passengers had undergone coronavirus tests before boarding.

The vessel, operated by TUI Cruises, has 922 passengers and 666 crew members on board and began its trip late Sunday from the port of Iraklio, on the island of Crete.

Follow AP pandemic coverage at http://apnews.com/VirusOutbreak and https://apnews.com/UnderstandingtheOutbreak

A man wearing a mask to prevent the spread of the coronavirus looks out of the Mein Schiff 6 cruise ship as it is docked at Piraeus port, near Athens on Tuesday, Sept. 29, 2020. Greek authorities say 12 crew members on a Maltese-flagged cruise ship carrying more than 1,500 people on a Greek islands tour have tested positive for coronavirus and have been isolated on board.(AP PhotoPetros Giannakouris)

A man wearing a mask to prevent the spread of the coronavirus looks out of the Mein Schiff 6 cruise ship as it is docked at Piraeus port, near Athens on Tuesday, Sept. 29, 2020. Greek authorities say 12 crew members on a Maltese-flagged cruise ship carrying more than 1,500 people on a Greek islands tour have tested positive for coronavirus and have been isolated on board.(AP PhotoPetros Giannakouris)

Passengers of the Mein Schiff 6 cruise ship wearing a mask to prevent the spread of the coronavirus arrive for a breakfast as the ship is docked at Piraeus port, near Athens on Tuesday, Sept. 29, 2020. Greek authorities say 12 crew members on a Maltese-flagged cruise ship carrying more than 1,500 people on a Greek islands tour have tested positive for coronavirus and have been isolated on board. (AP PhotoPetros Giannakouris)

Passengers of the Mein Schiff 6 cruise ship wearing a mask to prevent the spread of the coronavirus arrive for a breakfast as the ship is docked at Piraeus port, near Athens on Tuesday, Sept. 29, 2020. Greek authorities say 12 crew members on a Maltese-flagged cruise ship carrying more than 1,500 people on a Greek islands tour have tested positive for coronavirus and have been isolated on board. (AP PhotoPetros Giannakouris)

A passengers of the Mein Schiff 6 cruise ship takes pictures with her mobile as the ship is docked at Piraeus port, near Athens on Tuesday, Sept. 29, 2020. Greek authorities say 12 crew members on a Maltese-flagged cruise ship carrying more than 1,500 people on a Greek islands tour have tested positive for coronavirus and have been isolated on board.(AP PhotoPetros Giannakouris)

A passengers of the Mein Schiff 6 cruise ship takes pictures with her mobile as the ship is docked at Piraeus port, near Athens on Tuesday, Sept. 29, 2020. Greek authorities say 12 crew members on a Maltese-flagged cruise ship carrying more than 1,500 people on a Greek islands tour have tested positive for coronavirus and have been isolated on board.(AP PhotoPetros Giannakouris)

Greek healthcare ministry officials enter the Mein Schiff 6 cruise ship as the ship is docked at Piraeus port, near Athens on Tuesday, Sept. 29, 2020. Greek authorities say 12 crew members on a Maltese-flagged cruise ship carrying more than 1,500 people on a Greek islands tour have tested positive for coronavirus and have been isolated on board. (AP PhotoPetros Giannakouris)

Greek healthcare ministry officials enter the Mein Schiff 6 cruise ship as the ship is docked at Piraeus port, near Athens on Tuesday, Sept. 29, 2020. Greek authorities say 12 crew members on a Maltese-flagged cruise ship carrying more than 1,500 people on a Greek islands tour have tested positive for coronavirus and have been isolated on board. (AP PhotoPetros Giannakouris)

A woman wearing a mask to prevent the spread of the COVID-19 looks out of the Mein Schiff 6 cruise ship as it is docked at Piraeus port, near Athens on Tuesday, Sept. 29, 2020. Greek authorities say 12 crew members on a Maltese-flagged cruise ship carrying more than 1,500 people on a Greek islands tour have tested positive for coronavirus and have been isolated on board. (AP PhotoPetros Giannakouris)

A woman wearing a mask to prevent the spread of the COVID-19 looks out of the Mein Schiff 6 cruise ship as it is docked at Piraeus port, near Athens on Tuesday, Sept. 29, 2020. Greek authorities say 12 crew members on a Maltese-flagged cruise ship carrying more than 1,500 people on a Greek islands tour have tested positive for coronavirus and have been isolated on board. (AP PhotoPetros Giannakouris)