A warrant is out for his arrest, and he is wanted on charges of wounding with intent to cause grievous bodily harm, and injuring with intent to cause grievous bodily harm.
Austin has links to the Warkworth and Wellsford areas, but has associates in Whangarei and King Country, police said. He is aware that police are looking for him.
"Robert Austin is considered dangerous and should not be approached," police said in a statement.
Another man has already been charged in relation to the attack on the two Korean men. He is currently before the courts, and has been granted name suppression.
Anyone who knows where Austin is, or who has seen him, is asked to immediately call 111.