BERLIN — A far-left activst group in Germany has claimed responsibility for a suspected arson attack that left tens of thousands of homes, as well as hospitals and businesses, without power in around-freezing temperatures.

The Vulkangruppe (Volcano Group) said in a statement that the fossil fuel economy, not cutting power, was the target of the action.

Around 45,000 households and 2,200 businesses were left without electricity in southwest Berlin after high-voltage power lines were damaged by the fire, which authorities have described as a politically motivated attack by far-left extremists.

Though power has been restored in some areas, thousands could be left without power until Thursday after what authorities say was a politically motivated attack by “left-wing extremists”.

The blaze erupted on a cable bridge over the Teltow Canal near the Lichterfelde power plant on Saturday morning, local authorities said, affecting businesses and households across four districts, cutting their access to electricity, including internet and heating.

The state economy minister told German media that incendiary devices had caused the damage.

Berlin's mayor condemned the attack, accusing "suspected left-wing extremists" of knowingly endangering lives, especially those of patients in hospitals.

Hospitals and care facilities had received emergency power generators, officials said. The response had included transferring individuals from care sites and people requiring care in their own homes from the affected area to care facilities with reported available capacity.

Some hospitals had their electricity restored by Sunday.

As of Sunday afternoon, around 10,000 households and 300 businesses had been reconnected, with most still waiting to receive power back.

Some schools, which were due to reopen on Monday after the Christmas holidays, will remain closed.

The capital's electricity operator said it would take until Thursday to reconnect all customers.

The Vulkangruppe in its statement apologised to less affluent residents impacted by the power cuts, but said it had less sympathy for "the many owners of villas".

The statement said the attack on the gas-fired power plant was an "act of self-defence" and solidarity with those who protect the earth.

Police told AFP news agency they believed the statement was "plausible" while they continued to investigate, with other media reporting police thought it was credible.

The Vulkangruppe previously claimed responsibility for a suspected arson attack that halted production at Tesla's Berlin car factory in 2024. — Agencies