CANBERRA, March 15 (CNN) - All people arriving in Australia after midnight Monday local time will need to self-quarantine for 14 days, Prime Minister Scott Morrison announced today at a news conference.

There is no plan for mass school closures at this point, but the cabinet might discuss this issue further on Friday, Morrison said.

He also announced a ban on all cruise ships docking in Australia.

Earlier this week, the Morrison government advised the cancelation of all gatherings of more than 500 people, leading to the postponement of many sports events, such as the Formula One Australian Grand Prix.