UPDATE: Police have charged an 18-year-old man with conspiring to plan a terrorist attack on Anzac Day following multiple raids across Melbourne on Saturday morning.
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Sevdet Besim, of Hallam, appeared briefly in Melbourne Magistrates Court on Saturday afternoon.
In the hearing, which only lasted minutes, Besim, who was dressed in casual clothes, remained silent.
No application for bail was made and he was remanded in custody until a hearing on April 24.
Mr Besim was one two men, the other an 18-year-old from Hampton Park, who police allege were planning an Islamic State-inspired attack at a Melbourne Anzac Day event targeting police officers.
A third man was arrested over weapons offences, while two others were in custody assisting police.
In response to the raids, Premier Daniel Andrews said security will be boosted at next Saturday's dawn service and march, whilePrime Minister Tony Abbott urged people planning to attend Anzac Day events not to be deterred by the raids.
Australian Federal Police and Victoria Police executed seven search warrants on properties in Narre Warren, Hampton Park, Hallam and Eumemmerring about 4am on Saturday. Five men were arrested in the raids, the culmination of Operation Rising.
Both men arrested on suspicion of terrorism offences were "associates" but not relatives of Numan Haider, who was shot and killed by police in September 2014 after stabbing anti-terrorism officers at Endeavour Hills, Victoria Police acting Deputy Commissioner Shane Patton said.
The planned attack could have come "any time in the next week," acting Deputy Commissioner Patton said.
Police have refused to disclose what Anzac celebration had been targeted.
"We have acted swiftly to disrupt an attack intended to bring harm to everyday Victorians going about their business," acting Deputy Commissioner Patton said.
"During Anzac Day commemorations, we encourage people to continue with their plan, but remain vigilant.
Police said the men's plans were "ISIS inspired", a reference to Islamic State, also known as IS or ISIL.
"At this stage we have no information there was a planned beheading," AFP acting Deputy Commissoner Neil Gaughan said.
"Some evidence that we've collected at a couple of the scenes - and some other information we have - leads us to believe that this particular matter was ISIS-inspired. But it's early days and we're not going into further details than that."
Police declined to comment on whether it was "retaliation" for the shooting death of Haider last year.
Acting Deputy Commissioner Gaughan said police were comfortable the threat was "fully contained".
"But obviously as the investigations continue we'll continue chase the rabbit down the hole and see what comes of it," he said.
The weapons confiscated were all edged weapons, not firearms.
"There was a knife and there was a sword. There was suggestion of firearms but we have not seized any," acting Victoria Police Commissioner Tim Cartwright said.
Two men arrested in the raids sustained minor injuries. Another 18-year-old man, from Narre Warren, was arrested over weapons offences. Two other men, aged 18 and 19, both from Narre Warren, were also arrested and are in custody assisting police.
The men had frequented the al-Furqan bookshop and Islamic centre in Springvale South, which was also linked to Haider.
On Saturday morning, police continued to search several properties in the area.
Police removed evidence including a computer from a house in Hallam.
The house had a smashed window and the blinds on the property were pulled shut.
Four cars, including a silver BMW, were parked in the house's driveway.
An eyewitness to the Hallam raid, who spoke on condition of anonymity, said she woke about 3.30am to the noise of an argument between two men. Police arrived soon after and made an arrest.
"They are pretty decent people," she said. "We have met them a couple of times. They have had a couple of fights and stuff."
Another neighbour said a family of six lived in the house. She said the mother and father were lovely and had taken good care of her.
Their four boys, however, had "had the usual trouble with motorbikes and cars that young boys get into", the woman said.
Premier Daniel Andrews said security would be beefed up on ANZAC day in the wake of the threat, and would continue to be enhanced in coming days if necessary.
He said safety and security of every Victorian was the government's top priority, and authorities "are doing everything we can to tackle this threat."
But he added that the men arrested on Saturday were "not people of faith".
"They don't represent any culture. This is not an issue of how you pray or where you were born... this is simply evil: plain and simple," Mr Andrews said.
"This morning's operation is another reminder of the threats facing our community, our state and our nation - the threat that comes from violent extremism and radicalisation. It's a threat that confronts us all; it's a threat that challenges us, and in truth, it's a threat that we don't really properly understand."
Acting Deputy Police Commissioner Gaughan said the entire community should be concerned about the young age of the suspects.
"This is an issue not just for law enforcement but the broader community," he said.
"We need to get better in relation to identifying young men and women that are involved in this type of behaviour at the very early stages and we need intervention strategies to ensure that they don't go down this path."
EARLIER: Two men arrested in counter-terrorism raids were planning an "ISIS-inspired" attack at an Anzac Day event, police say.
Australian Federal Police and Victoria Police executed seven search warrants on properties in Narre Warren, Hampton Park, Hallam and Eumemmerring from 4am on Saturday. Five men were arrested in the raids.
Two 18-year-olds, from Hallam and Hampton Park, were arrested on terrorism-related offences.
Investigators allege the pair was planning a terrorist attack in Australia which would target police officers, Victoria Police said in a statement.
"We have acted swiftly to disrupt an attack intended to bring harm to everyday Victorians going about their business," Victoria Police acting Deputy Commissioner Shane Patton said.
"During Anzac Day commemorations, we encourage people to continue with their plan, but remain vigilant.
"The plan related to activities that were in the Melbourne area and we are not going to go into specifics at this stage."
Police said the men's plans were "ISIS inspired" but there was no specific suspicion that they planned to carry out beheadings.
The weapons confiscated were all edged weapons, suggesting knives or swords, and not firearms.
Acting Deputy Commissioner Shane Patton said the men who were arrested were "associates" but not relatives of Numan Haider, who was shot and killed by police in September 2014 after stabbing anti-terrorism officers at Endeavour Hills.
The men had frequented the al-Furqan bookshop and Islamic centre in Springvale South, which was also linked to Haider.
Police arrested five men in the raids. Another 18-year-old man, from Narre Warren, was arrested over weapons offences. Two other men, aged 18 and 19, both from Narre Warren, were also arrested and are in custody assisting police.
Police continue to search several properties in the area.
Four AFP officers are currently standing guard at a small tile-roofed house on a quiet suburban street in Hallam.
The house is nondescript except for the front window which has had a hole smashed in it.
It's not clear whether the damage was caused during this morning's raids.
All the blinds on the property have been pulled shut.
Four cars, including a silver BMW, are currently parked in the house's driveway.
An eyewitness to the Hallam raid, who spoke on condition of anonymity, said she woke about 3.30am to the noise of an argument between two men.