German authorities were Friday hunting a militant climate activist suspected of a spate of attacks on the power grid, the latest sabotage targeting critical infrastructure.
The 48-year-old man, named in German media as Daniel V., sent letters claiming responsibility for the acts and suspected explosives were found during searches of his apartment, officials said.
Germany has been rattled by attacks on electricity substations across the country this week which were apparently aimed at cutting power from coal-fired power stations and causing widespread blackouts.
"We must assume that this is a case of climate extremism," Interior Minister Alexander Dobrindt told journalists.
The Bild tabloid reported that a heavily armed elite police team had stormed a truck in Hambach Forest in North Rhine-Westphalia suspected of belonging to the activist, but had failed to apprehend him.
