The suspected Stockholm truck attacker had shown interest in extremist groups and had his permanent residency application rejected in June 2016, Swedish police said on Sunday.
The suspect in Friday's attack, a 39-year-old native of Uzbekistan who has been arrested by police, had been on authorities' radar previously but they dismissed him as a "marginal character". On Feb. 24, he was formally sought after by Swedish police. According to the paper, Police commander Jonas Hysing said, "we do not know where they are, so we can not enforce expulsion".
Floral tributes are left at the scene of the terrorist attack where a truck crashed after driving down a pedestrian street in downtown Stockholm on April 8, 2017 in Stockholm, Sweden.
Police have also confirmed that a second person has been arrested in connection with the Stockholm terror attack.
Another five others had been held for questioning in the investigation.
Six people were taken into custody for interrogation on between Saturday and Sunday in several areas across Stockholm, police said, without adding further details.
Two Swedes, a Belgian and a British man were killed in the attack on Friday. Their identities were not released by Swedish officials.
He worked as a director for music streaming service Spotify and was based in Stockholm with his family. Britain's Press Association news agency said he was 41.
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Other sources quoted by Expressen on Saturday said the man had already confessed to police at the time of his arrest in a northern Stockholm suburb on Friday, saying "I'm the one who did it".
The local authority in charge of monitoring those injured in the attack said that out of the 15 injured, 10 remain in hospitals, including a child.
"We believe it's our duty to come here and show our support for the Swedish society", he said.
"I thought everyone would run past me and save themselves", said Papusa Ciuraru, whose foot was crushed by a boulder displaced by the speeding truck. Nine wounded people are still hospitalized.
The truck was stolen minutes before the attack as it made a delivery at a restaurant.
Thousands of Swedes have gathered for a vigil in Stockholm for those who were killed in Friday's attack.
"The only light in this deeply tragic moment is the outpouring of love, compassion and solidarity that we have seen from everyone", said Spotify founder Daniel Ek on Facebook. "We must close the borders, throw everyone out, '" said Ulf Lundgren, a clergyman at Stockholm Cathedral.