Canberra - Australia’s prime minister has urged world leaders to crack down on social media companies that broadcast terrorist attacks in the aftermath of the New Zealand mosque shootings.

Prime Minister Scott Morrison has written to G-20 chairman Japanese Prime Minister Shinzo Abe calling for agreement on “clear consequences” for companies whose platforms are used to facilitate and normalize horrific acts.

Australian Brenton Tarrant has been charged with murder over the attack on two mosques in Christchurch that killed 50 people and left another 50 injured.

The attacks were live-streamed on Facebook.

Morrison says: “Social media companies are international businesses and it’s up to the international community to force them to act.”