At least 16 people were injured in the blast on Tuesday morning at a residential building in the city of Göteborg.
At least 16 people have been injured after a powerful explosion ripped through an apartment building in Sweden.
Hundreds more were evacuated after the blast, which occurred in the early hours of Tuesday in the Annedal district of Göteborg.
Sahlgrenska University Hospital spokeswoman Ingrid Frederiksson said 16 people were taken to the city's main hospital.
Six people — including three older women and a man in his 50s — were treated for serious injuries, police said. Four people remained in the hospital on Wednesday.
Police suspect that an explosive device may have caused the damage, and an investigation is underway.
On Thursday, the authorities confirmed they had identified the man they wanted to arrest over the explosion
"The arrested person is suspected on probable grounds of public destruction, a serious crime," police said in a statement.
"The person is arrested in absentia and has not yet been located by the police."
"Police and prosecutors are continuing to work broadly with the investigation, but at this stage, there are no indications that the blast is linked to gang crime."
Fires from the blast spread to several apartments in the complex, which burned for several hours before being extinguished.
Images from the scene showed thick white smoke billowing from the building's windows, while emergency crews swarmed the area.
"Investigative measures are being taken in the context of the preliminary investigation into a public nuisance," a statement read.
"We believe something has exploded that is not of natural causes," Police spokesperson Thomas Fuxborg later told a news conference, adding that something had "probably" been placed at the site of the explosion.
According to AFP, the head of emergency operations stated that the building is not supplied with gas.
At a press conference, Swedish Prime Minister Stefan Löfven said the incident affects "the whole country".
"I think we all want to know more, want to understand what happened, what caused the explosion," added Interior Minister Mikael Damberg.
"The police have been able to start investigative work ... I think we should be careful not to contribute to speculation."
Sweden has been struggling for several years to deal with the rise of criminal gangs, which have included a high number of fatal shootings and explosions.