The young boy did study chemistry and had skills in bombs too. Internet had probably served as the knowledge sourse.
The police didn't know why. To get some more feelings we decided to ask the man on the street. This time Erica from Chicago was asked about this and she answered that "He must not have been very happy". Probably this is the case.
The ceremonies in the Filadelfia church where quite much about the incident and on Friday, at the time of the explosion, pastor Per Hall ended quickly his preaching and the youth meeting switched to a prayer meeting.
The explosion was set up in a mall, in the middle of 1000 to 2000 shoppers. The explosives where wrapped with metal grain.
For more information go to
EN: http://news.bbc.co.uk/2/hi/world/europe/2322275.stm
SWE: http://www.expressen.se/article.asp?id=125731
FI: http://www.jippii.fi