Who was Philip F.? According to Hamburg police chief Ralf Martin Meyer, the weapons authority received anonymous information in January that the perpetrator might be mentally ill. The aim of the unknown writer was to have the behavior and the gun regulations in relation to Philipp F. checked. The unknown person wrote that F.'s mental illness may not have been medically diagnosed because F. is not seeking medical treatment. According to the letter, F. was particularly angry with religious followers, especially Jehovah's Witnesses and his former employer.
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