mass shooting
All caught on live TV.
He has been named by local media reports as 28-year-old Australian Brenton Tarrant.
A gunman live-streamed the killings online.
He said he 'wanted them all to die'.
Many Americans do support some gun control measures, but a concoction of cultural, psychological and political aspects make fundamental change very unlikely
'Who would ever think a thing like this would happen?' US President asks.