The police write on their website that they were alerted around 2 am, when a dangerous object detonated near a car.
Not far from there, there was also a suspected dangerous object that had been thrown into a residence, says Anders Bryngelsson, press spokesperson for the Stockholm police.
There were also people present, but the suspected dangerous object never detonated, so no one was injured.
A man of mature age has been arrested, suspected of attempted murder and general public destruction. The police's national bomb squad has handled the object and the cordons that were in place during the night will be lifted in the morning.
