No one was injured because the fire was set late at night. Arson was determined as the cause, but no one has been charged with the crime so far. Apparently someone set some inflammables burning against a back door in an alcove. The fire mainly got into the roof, which burned rather slowly, leaving most of the wall structure standing. The fire was calm enough that firemen were able to throw waterproof tarpaulins over the books in the library, saving the entire library from damage.
Plans are to rebuild the place next winter via a quick-build.