BERLIN, March 5 (Reuters) - A letter claiming the

suspected arson attack on Tesla's car factory outside Berlin in

the name of a far-left militant group calling itself the

"Volcano Group" surfaced on an alternative media website on

Tuesday.

"We sabotaged Tesla," read the letter, posted on website

kontrapolis.info, describing the attack as a gift marking March

8 - International Women's Day. "Tesla consumes earth, resources,

people, workers and in return spits out 6,000 SUVs, killer cars

and monster trucks each week."

Police said they were aware of the letter, which was signed

"Agua De Pau", the name of a volcanic mountain in the Azores,

and said they were checking its authenticity.