Airbus said on Sunday about 500 of its staff had gone into quarantine after 21 workers at its aircraft factory in Hamburg, Germany, tested positive for the new coronavirus, Reuters reported.

The company said the staff had been asked to stay at home as a precautionary measure, and it was examining whether the measures would impact production at the site.

Health officials were still investigating what caused the outbreak, a spokesman of the Hamburg health authority said.

It was also still unclear whether the workers had caught the more contagious variant of the coronavirus which was first discovered in Britain and is now rapidly spreading across Europe, he added.