The deadly bow-and-arrow attack carried out by a Danish suspect in a small Norwegian town yesterday that claimed the lives of five people "currently appear[s] to be an act of terrorism," Norway's national security agency announced Thursday.

The suspect – a Muslim convert who was previously flagged as having been radicalized, according to police – is accused of having shot at people in a number of locations in the town of Kongsberg on Wednesday evening. Several of the victims were in a supermarket, police said. 

"There earlier had been worries of the man having been radicalized," Police chief Ole B. Saeverud said during a news conference. He added that there were "complicated assessments related to the motive, and it will take time before this is clarified." He didn't elaborate on what was meant by being radicalized. 

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Police work near a site Thursday after a man killed some people in Kongsberg, Norway.

Police work near a site Thursday after a man killed some people in Kongsberg, Norway. (Terje Bendiksby/NTB via AP)

Norway’s domestic security agency, known by its acronym PST, cited various aspects of the attack that also wounded two people in explaining its belief that the suspect's actions "currently appear to be an act of terrorism." 

"Attacks on random people in public places are a recurring modus operandi among extremist Islamists carrying out terror in the West," the domestic security agency said. 

The agency said that "the most probable scenario of an extremely Islamist terrorist attack in Norway is an attack carried out by one or a few perpetrators with simple weapon types, against targets with few or no security measures." 

It added that the suspect "is known to PST from before, without PST being able to provide further details about him."

"The investigation will clarify in more detail what the incidents were motivated by," PST said in a statement.  

An arrow is seen in a wall after an attack in Kongsberg, Norway, on Wednesday. 

An arrow is seen in a wall after an attack in Kongsberg, Norway, on Wednesday.  (Håkon Mosvold Larsen/NTB via AP)

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Ann Iren Svane Mathiassen, the police attorney who is leading the investigation, told Norwegian broadcaster NRK that the suspect will be assessed by forensic psychiatric experts Thursday. 

"This is not unusual in such serious cases," she was quoted as saying. 

The victims were four women and one man between the ages of 50 and 70, Saeverud said. 

Police were alerted at 6:12 p.m. Wednesday to a man shooting arrows in Kongsberg, some 41 miles southwest of Oslo. Officers made contact with the suspect but he escaped and wasn’t caught until 6:47 p.m., Saeverud said. 

Officials believe the man didn't start killing people until police arrived on the scene. 

"From what we know now, it is reasonably clear that some, probably everyone, was killed after the police were in contact with the perpetrator," Saeverud said. 

Police work near a site on Thursday after a man killed several people in Kongsberg, Norway.

Police work near a site on Thursday after a man killed several people in Kongsberg, Norway. (Håkon Mosvold Larsen/NTB via AP)

Speaking calmly and clearly after his arrest, the suspect told police, "I did this," said Svane Mathiassen. The suspect "clearly described what he had done. He admitted killing the five people," she told The Associated Press.

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The rampage happened in clear view of dozens of witnesses in this small town, which today is in hushed shock, according to onlookers. Police have already spoken to between 20 and 30 witnesses who saw the attacker wound and kill his victims, according to Svane Mathiassen. 

"There are people who saw him in the city. Before the killings. That is when he injured people," she said. 

Erik Benum, who lives on the same road as the supermarket that was one of the crime scenes, told the AP that he saw the escaped shop workers sheltering in doorways. 

"I saw them hiding in the corner. Then I went to see what was happening, and I saw the police moving in with a shield and rifles. It was a very strange sight." 

The following morning, the whole town was eerily quiet, he said. "People are sad and shocked." 

The bow and arrows were just part of the killer’s arsenal. Police are yet to confirm what other weapons he used. Weapons experts and other technical officers are being drafted in to help with the investigation. 

Both the hospitalized victims are in intensive care. They include an off-duty police officer who was inside the store. Their condition was not immediately known. 

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The suspect is being held on preliminary charges, which is a step short of formal charges. He will formally face a custody hearing Friday. Police believe he acted alone. 

"It goes without saying that this is a very serious and extensive situation, and it naturally affects Kongsberg and those who live here," Police spokesman Oeyvind Aas said earlier. 

Norwegian media reported that the suspect previously had been convicted of burglary and possession of drugs, and last year a local court granted a restraining order ordering him to stay away from his parents for a six-month period after he threatened to kill one of them. 

Newly appointed Prime Minister-Jonas Gahr Stoere called the attack "horrific." 

"This is unreal. But the reality is that five people have been killed, many are injured and many are in shock," Gahr Stoere told Norwegian broadcaster NRK. 

In a statement to the mayor of Kongsberg, Norwegian King Harald V said people have "experienced that their safe local environment suddenly became a dangerous place. It shakes us all when horrible things happen near us, when you least expect it, in the middle of everyday life on the open street." 

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U.N. Secretary-General Antonio Guterres wrote on Twitter that he was "shocked and saddened by the tragic news coming from Norway." 

The main church in Kongsberg, a small town of some 26,000 inhabitants, was open to anyone in need of support. 

"I don’t think anyone expects to have these kinds of experiences. But nobody could imagine this could happen here in our little town," parish priest Reidar Aasboe told the AP. 

Mass killings are rare in low-crime Norway, which has some of the toughest gun laws in the world.

Lovdata, a website that publishes information about the country's laws, says anyone in Norway "who wants to acquire or have a firearm must have a permit from the police" and "anyone who wants to acquire or have ammunition must either have a license to have and use firearms in which the ammunition fits, or have a special permit from the police."

The country’s worst peacetime slaughter was on July 22, 2011, when right-wing extremist Anders Breivik set off a bomb in the capital, Oslo, killing eight people. Then he headed to tiny Utoya Island, where he stalked the mostly teen members of the Labor Party’s youth wing and killed another 69 victims. 

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Breivik was sentenced to 21 years in prison, the maximum under Norwegian law, but his term can be extended as long as he’s considered a danger to society. 

PST said Thursday that the terror threat level for Norway remains unchanged and was considered "moderate."