The manhunt continues for a gunman after a top US executive was fatally shot in the back in New York's Manhattan.  

The victim is 50 year old UnitedHealth CEO Brian Thompson.  

Police say it was a brazen, targeted attack carried out by someone who was proficient with firearms.  

US Correspondent Kate Fisher told Ryan Bridge that authorities are telling people not to panic.  

She says Mayor Eric Adams is assuring people they're safe to go about their business. 

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