Protest over climate crisis and AI has cut power to tens of thousands of homes which may take days to fully restore

German leftwing militants protesting over the climate crisis and AI have claimed responsibility for an arson attack that cut power to tens of thousands of households in Berlin.

The fire that broke out on a bridge across the Teltow canal in the south-west of the capital early on Saturday could deprive up to 35,000 homes and 1,900 businesses of electricity – and in many cases heat – until 8 January, the grid company Stromnetz Berlin said.

As state security authorities opened an investigation into the cause of the blaze near the Lichterfelde heat and power station that damaged several high-voltage cables, the Vulkangruppe (Volcano Group) said it had deliberately targeted some of the city’s wealthiest districts.

In a 2,500-word pamphlet seen by the Guardian which a police spokesperson called “credible”, the group said it had aimed to “cut the juice to the ruling class”.