The boy was responsible, according to the prosecutor, for an account used to find perpetrators in ongoing gang conflicts in Sweden and abroad, reports Hallands Nyheter.
In the boy's room, the police found four mobile phones, which contained images of weapons and bundles of banknotes. In chats, the boy is seen looking for people who can commit shootings and explosions.
He has admitted that it is he who has posted the ads, but he has not told who else is involved or who the intended targets are, says prosecutor Ludmila Pronko to the newspaper.
The boy is being prosecuted in Varberg District Court for incitement to murder.