Police Commissioner Andrew Scipione

Three of four people arrested in Australia over a terror-linked murder by a radicalised teenager have been released without charge in a move police admitted today was "incredibly frustrating".

The commissioner of police in Australia's New South Wales state, Andrew Scipione, said today he was concerned that the man who took hostages in a Sydney cafe siege had been granted bail on earlier charges, leaving him free in the community.

Three of four people arrested in Australia over a terror-linked murder by a radicalised teenager have been released without charge in a move police admitted today was "incredibly frustrating".

The commissioner of police in Australia's New South Wales state, Andrew Scipione, said today he was concerned that the man who took hostages in a Sydney cafe siege had been granted bail on earlier charges, leaving him free in the community.