One video showed the man repeatedly lunging at police officers with what looked to be a knife.
Police are treating the incident as a terror attack.
A fearless bystander dubbed "Trolley Man" has been praised for his selfless actions in his attempt to halt a knife-wielding man who'd stabbed three people in Melbourne's Bourke Street.
One person was killed and two were wounded after being attacked by a man. "He is someone who is accordingly known to Victoria Police and the federal intelligence agencies", he said. We'll keep an open mind as to whether there's any link.
"Police shot the male in the chest and he is now in a critical condition in hospital", Superintendent Clayton said, adding the officers are okay".
Mr Gaut then went back into the McDonalds, which was in lockdown for more than an hour, to pat the shoulder of a trembling witness recounting his account to police. A bomb squad rendered them safe without any exploding.
Friday's attack is a double blow for the city as it coincides with an ongoing the murder trial of 28-year-old James Gargasoulas, who ploughed his vehicle into crowds in the same area in 2017, killing six people.
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In a tweet Mr Acosta says he was stopped by the Secret Service when he tried to re-enter the White House on Wednesday evening. The CNN reporter has made a name for himself by asking combative questions of Trump and other administration officials.
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He recused himself the next day, saying it would be inappropriate to oversee an investigation into a campaign he was part of. The president also warned the Democrats against investigating him, after taking over the House in the midterm elections .