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Last night there were 4 shooters and 2 getaway cars rigged with explosives. Now I'm hearing there was 1 shooter, possibly a couple accomplices, and only 1 car with explosives.
A common theme with false flag events is initial reports of multiple attackers, which gets scrubbed away and whittled down to just 1.

I think I mentioned this elsewhere in a comment, but my information is that Tarrant was in custody before the second mosque came under attack, meaning that there were at least two teams, if not two separate incidents.