The alarm about the incident came at 19.30 and the national bomb squad has worked on the site during the evening and night.
Residents in the actual apartment building are urged to stay in their apartments, said the police's press spokesperson Susanna Rinaldo during the evening.
Even roads in the vicinity have been blocked off.
We have initiated a preliminary investigation into preparation for murder and serious crime against the law on flammable and explosive goods, says Susanna Rinaldo.
According to information to TV4 and Aftonbladet, it is hand grenades that have been found, but Susanna Rinaldo does not want to comment on that.
Around 00.30 at night to Wednesday, the police announced that the object had been neutralized by the National Bomb Squad and that only a minor cordon remains.
