Australian Prime Minister Scott Morrison has declared a “human biosecurity emergency” and said the country's citizens should abandon all overseas travel because of the coronavirus epidemic, Reuters reported.

The formal declaration gives the government the power to close off cities or regions, impose curfews and order people to quarantine, if deemed necessary to contain the spread of the virus.

The upgrade in official advice to an unprecedented “Level 4: Do not travel” to any country in the world, was accompanied by a ban on any non-essential indoor gatherings of more than 100 people.

“Life is changing in Australia, as it is changing all around the world,” Morrison said during a televised news conference. “Life is going to continue to change, as we deal with the global coronavirus. This is a once-in-a-hundred-year type event.”