Australian police are on high alert in Victoria State.<br/> <br />Officers had asked an 18-year-old man to come to this Melbourne police station because his behaviour was "causing concern".<br/> <br />(SOUNDBITE)(English) VICTORIA POLICE CHIEF COMMISSIONER KEN LAY SAYING:<br/> <br />"This was a planned and agreed meeting that was to occur at the Endeavour Hills police station. When these two police officers approached him, they were stabbed, one very seriously."<br/> <br />One of the officers then shot dead the teen, whose passport had earlier been cancelled on security grounds.<br/> <br />(SOUNDBITE)(English) JUSTICE MINISTER MICHAEL KEENAN SAYING:<br/> <br />"I can advise that the person in question was a known terror suspect who was a person of interest to law enforcement and intelligence agencies."<br/> <br />Police say the man had been displaying a flag linked to the militant group Islamic State at a local shopping mall. Local media reported he had been shouting insults about Prime Minister Tony Abbott and the gove
