SAN FRANCISCO/BENGALURU (Reuters) – The Friday massacre at two New Zealand mosques, live-streamed to the world, was not the first internet broadcast of a violent crime, but it showed that stopping gory footage from spreading online persists as a major challenge for tech companies despite years of investment.

An injured person is loaded into an ambulance following a shooting at the Al Noor mosque in Christchurch, New Zealand, March 15, 2019. REUTERS/SNPA/Martin Hunter

The massacre in Christchurch was live-streamed by an attacker through his Facebook profile for 17 minutes, according to a copy seen by Reuters. Facebook said it removed the stream after being alerted to it by New Zealand police.

But a few hours later, footage from the stream remained on Facebook, Twitter and

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