"If we do not know where they are, we can not enforce the expulsion", the national police commander, Jonas Hysing, said.
Akilov had applied to Swedish authorities for residency in 2014, but had been informed in December 2016 that "he had four weeks to leave the country".
"We will never surrender to terror", Lofven said in his speech outside Stockholm's city hall, as flags flew at half mast across the capital and church bells chimed while shoppers and tourists thronged the city centre. However, unlike similar vehicle attacks in Berlin, Nice, and London however, IS has not claimed the incident.
"We need to detain people when there is a risk they will go underground, and there appear to be around 10,000 to 15,000 cases", Akesson said.
"We need to detain people when there is a risk they will go underground, and there appear to be around 10,000 to 15,000 cases", said Mr Akesson, whose party won nearly 13 per cent of votes in the 2014 legislative election.
Everyone who has been denied a permit should return home.
U.S. Air Force deploys nuke-sniffer jet to Japan
The last nuclear test took place in September and was the third such test under Kim since he assumed power in late 2011. The aircraft may be being deployed ahead of a possible sixth nuclear test in North Korea.
Arrested several hours after the attack, the suspect was to be formally remanded in custody by Tuesday at the latest.
Security services have said Akilov expressed sympathies with extremist organisations, including Islamic State, but said he had not been viewed as a militant threat.
"A confession is not enough to be convicted of a crime, other evidence is needed to back this up", Ihrman told reporters at the courthouse.
"I mowed down the infidels", Aftonbladet quoted him as saying, citing sources close to the investigation and describing him as a father of four whose family had stayed behind in Uzbekistan.
According to police, components were found in the truck that could be used to make a "dangerous" object. National police Commissioner Dan Eliasson said "there was nothing in the system that indicated (he) would do something like he did on Friday".
After Mr Eriksson's statement, the rest of the hearing was held behind closed doors at the request of the public prosecutor's office and journalists were told to wait outside. Akilov reportedly confessed to police, telling them he "achieved" what he could.
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