Six of the suspects are conscripts. Two others are members of the permanent staff of the Defence Forces, reports the newspaper Helsingin Sanomat.
The accident was caused by double loading, according to a committee set up by the Accident Investigation Board. Technical problems were not detected.
Investigator Heikki Topi-Hulmi says, according to the law, sufficient monitoring should have prevented double loading.
The preliminary investigation will be ready in a few weeks. One conscript died and five more were injured in the accident. YLE24