In letters sent to authorities and the media, the author cited the fight against fossil fuels as a motive for the sabotage, Sweden Herald reported.
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The new finds on Saturday were made at substations in Bärwalde and Graustein in the state of Saxony. According to local authorities, they are 12 homemade explosive devices.
The police say they are investigating whether there is a connection to the previous incidents at substations around Germany.
