The 39-year-old Uzbek man – named in Swedish media as Rakhmat Akilov – is connected with having driven a truck into a city retail chain on Friday.
His application for residency was rejects in June a year earlier and he was being hunt down by improvement masters.
By then, a moment suspect has been put under formal catch.
Police, who have not formally named Mr Akilov as the principle suspect, said they were assessing the second suspect for a “mental dissident wrongdoing by exhibiting murder”.
Regardless, Reuter’s news office said the individual was gotten on “a lower level of instability” than the guideline suspect.
Police have chatted with more than 500 individuals over the scene, Sweden’s TT news office reports.
On Sunday, individuals gathered in focal Stockholm for a “Lovefest” vigil against mental mishandle, and laid sprouts outside the Ahlens shop in tribute.
More than 20,000 individuals went to the vigil, AFP bare essential, referring to city authorities.
City chief Karin Wanngard told the get-together: “Fear can’t win… Or, then again perhaps we should consider the idea and openness that delineates our city.”
Mr Akilov had related for unchanging residency in 2014, yet this was rejected, and in December 2016 he was given four weeks to leave the nation, police administrator Jonas Hysing told a question and answer session.
The theorize then vanished, and police started pursuing down him, Mr Hysing included.
He was known to have conferred affectability for get-togethers including expected Islamic State, however had been seen comparatively as a “periphery character”, police said.
Four individuals are bore witness to have kicked the compartment in the strike. Police have not discharged their characters, yet rather said they were:
Another 15 individuals were harmed.
The truck, got from a lager affiliation, was crashed into Ahlens retail chain in the capital on Friday evening.
No fear based oppressor assemble has guaranteed to be behind the trap.
Sweden has taken in practically 200,000 removed people and vagrants beginning late – more per capita than whatever other European nation.
All things considered, there was a drop in numbers a year back after the nation displayed new edge checks.
Openly, Sweden is recognized to have the most raised number of Islamic State amass contenders per capita in Europe.
Around 140 of the 300 who went to Syria and Iraq have since returned, leaving the experts to consider how best to reintegrate them into society.