A fire in southwest Berlin that has left tens of thousands in the German capital without electricity was likely the result of a far-left extremist attack, officials said on Sunday. Grid company Stromnetz Berlin said on Saturday that the suspected arson attack could leave up to 45,000 households without power until January 8. Following the attack, local media published a letter purportedly from a far-left activist organisation called the Volcano Group that claimed responsibility for the incident, saying its actions were directed at the fossil-fuel based energy industry. "The letter claiming responsibility has been classified as authentic by the security...