@sqgl There's a reason why they're being deliberately vague at this stage.

In a similar situation in 2016, one man (the attacker) was killed and four people were injured, after an attacker carried a knife around Westfield Hornsby: https://www.news.com.au/national/nsw-act/crime/police-shoot-and-kill-knifeman-at-westfield-hornsby/news-story/09e98074a9f0534020686a76ebee783c

After the official investigation, it turned out the four bystanders who were injured were accidentally struck by police bullets that ricocheted, rather than the attacker himself.

I'm definitely not saying that's the case this time, but they're likely to be vague until they can rule something like that out.