Who burned the Library of Alexandria?

Although the Library of Alexandria is referred to in numerous contemporary sources, there is not a great deal of material directly describing the library itself. By the modern era the library had come to symbolize the entirety of knowledge in the ancient world. Important to this symbolism are claims about the size of the library; the comprehensiveness of its collection, especially regarding books that no longer exist; and the circumstances of its destruction. Various authors explicitly blame certain individuals or groups for having destroyed the library, and this has given rise to complex accusations of bias. It is quite possible that the library suffered numerous complete or partial destructions in its long history.