Swedish police said on Sunday that they have conducted raids in the greater Stockholm area as part of an investigation into a truck attack that killed four people earlier this week.
Police spokeswoman Eva Nilsson confirmed a police raid in Sollentuna, a suburb north of Stockholm, but declined to give further details. 
"There is only one person under arrest," she said, referring to a39-year-old Uzbek national detained late Friday, just hours after the attack, in which is is suspected of having driven the vehicle.
Police also raided an apartment in the southern suburb of Varberg late Saturday and reportedly seized items including what appeared to be laptop bags.
The Aftonbladet daily reported that the 39-year-old suspect had visited the apartment that was subject to the raid a few hours before the attack and had connected to a wireless internet network.
Seven people were being questioned in relation to the attack, Jonas Hysing of the national police told Swedish broadcaster SVT.
Three of the four victims in the attack have been identified and their next of kin notifed, Hysing told broadcaster SVT. Ten people injured in the truck attack were still in hospital. Four were described as seriously injured.
The remaining cordons on the central pedestrian street Drottninggatan where the attack took place have been lifted.
Later on Sunday, a public gathering was to be held at the central Segels Torg square, adjacent to the Ahlens department store, where the truck crashed.
Related Story