The family who lived in the flat has been moved to a secret location, as has the mother and the siblings of the 8-year-old boy who died in the explosion. They had come over from England to visit their relatives, and were sleeping on the floor in the flat's living-room when the grenade came in through the window.
Swedish Television News reports that police have analysed the current threat level against the family living in the flat, but they do not want to make any comments about it.
Press spokesperson Stefan Gustafsson said he was not aware whether the family had demanded protection from the police in the past, but noted that full-scale police protection is preceded by an extensive investigation.
"You need substantial background with a concrete threat scenario, and reports to the police," he said.
The father of the boy who died has been speaking to media, expressing his devastation at the loss of his son.
"I have only been in Sweden once before, it may have been in 2004. I had a picture of Sweden as a nice country. I would never have believed that something like this could happen in Sweden," Abdiwahid Warsame told the daily Göteborgs-Posten.
On Wednesday afternoon he finally received the necessary travel documents so that he can come to Sweden and be with his family here.