Investigators are also working to establish whether the killer acted alone when he fatally shot three people and wounded several others.
Aspiring pilot Joshua Watson escaped and helped authorities stop a shooter at a Florida Naval base. He later died of his wounds.
Boxed in by impeachment,Trump has backed away from action on gun safety and youth vaping. He believes he cannot make decisions that will upset his base.
Jae Tregear had to be airlifted to hospital on Thursday after he was targeted in a suspected drive-by attack at Penrith. It's the second time this year he has been shot at.
Since its debut Joker has drawn both rave reviews and concerns over its realistic portrayal of a character sliding into a psychosis that leads him to kill.
The proposed measures come after the government rushed through legislation in April to ban assault weapons such as AR-15 style rifles.
The resolution,adopted unanimously by the board's 11 supervisors,notes many of the statistics that make the US stand out in terms of gun violence.
After agreeing to initial reforms following the Christchurch attacks,NZ Opposition leader says his party is unlikely to support a second raft of changes.
President's conversation with Wayne LaPierre further reduced hopes that major new gun-safety measures would be enacted after the latest round of mass shootings.
The bulletproof panels are designed to withstand multiple rounds from a handgun - and two of this season's bestsellers are emblazoned with Disney princesses and Avengers superheroes.
NRA chief executive Wayne LaPierre spoke to Trump after the President expressed support for a background check bill and told him it would not be popular among his base.