It was at the end of June this year that something detonated outside a villa in Upplands-Bro north of Stockholm.
The object was examined by police bomb and forensic technicians and later turned out to be a hand grenade.
At least one person was in the house but no one was injured.
According to the indictment, however, the incident has caused danger to the life of the family and extensive destruction of property.
SVT has previously taken part in a surveillance film from the home in question that shows the course of events.
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Here it explodes at the villa in Upplands-Bro Photo: Crime scene Sthlm / Marco Blomberg / STHLMNEWS
The 18-year-old is also suspected of infection from a traffic accident site.
According to the indictment, the man who lives in the house earlier the same day must have collided with the suspect.
During questioning, the man says that he undoubtedly connects the traffic incident with the explosion.
More events in a short time
The incident was one of several that affected Upplands-Bro for a relatively short time.
Among other things, the security center in Bro was threatened with a bomb via social media, a bag marked with the word "bomb" was placed outside the town hall in Kungsängen and several car fires took place.