Hong Kong (CNN Business) Horrific video of the mosque massacre in Christchurch was viewed live fewer than 200 times on Facebook but that was enough to unleash it across the internet.

Now New Zealand, other governments and business leaders are calling for Facebook, Google and Twitter to do much more to rid their platforms of extremist content.

Vodafone VOD Facebook FB Twitter TWTR Google GOOGL and two other telecommunications operators, which provide internet access for most New Zealanders, said on Tuesday they wantCEO Mark Zuckerberg,CEO Jack Dorsey andCEO Sundar Pichai to take part in an "urgent discussion" on how to keep harmful content off their platforms.

The three US tech companies have faced heavy criticism after they failed to identify and stop the spread of a video of Friday's attack in which 50 people at two mosques were killed.

The CEOs of Vodafone New Zealand, Spark and 2degrees said they had taken the unprecedented step of jointly identifying and suspending access to sites that were hosting video footage taken by the attacker. They called on authorities to require tech companies to take down terrorist-linked content within a specific period of time and fine them if they fail to do so.

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