The government said flags on Commonwealth buildings would be lowered to half-mast in tribute on Tuesday.
Australian police have launched an investigation after a childcare centre was torched on Tuesday.
Under the new law, social media companies will be required to take “reasonable steps” to prevent children under 16 from accessing their platforms.
The minister said the country’s defence budget was increasing, but his government was prioritising its purchases.
Australia has joined the list of countries introducing stringent visa policies in recent times.
Before her detention, the Chinese-born Australian had worked for Beijing-run media outlet CGTN.
“Currently doctors are doing everything they can,” Mr Kishida told reporters. “At this moment, I am hoping and praying that former PM Abe will survive this.”
