Norwegian authorities are tracing passengers from recent Arctic voyages after at least 40 crew and passengers from a luxury cruise liner tested positive for the novel coronavirus, the country's public health department said.

All 158 crew members from the MS Roald Amundsen have been tested after 36 of them and four passengers were diagnosed with the disease on Friday, Hurtigruten, the owner of the ship, currently docked at the port of Tromsoe, said in a statement.