9 The file keeper of the personal data files referred to in sections 2-4 and 6(1) and in sections 30 and 31 is the Supreme Police Command; the file keeper of the personal data file referred to in section 5 is the Security Police; and the file keeper of the personal data file referred to in section 6(2) is the police unit in charge of the operation. Section 8 Establishing personal data files (1) The decision to establish a personal data file as referred to in section 6(1) is made by the Supreme Police Command, and the decision to establish a personal data file as referred to in section 6(2) is made by the police unit in charge of the operation. (2) Establishing personal data files other than those referred to in sections 2-5 and in sections 30 and 31 requires a decision in writing. In respect of temporary or manually maintained personal data files for nationwide use as referred to in section 6, the decision on establishing a file and any significant alteration to it shall be notified to the Data Protection Ombudsman no later than one month before the file is established or altered. The decision to establish a personal data file shall state the purpose of use of the file. Section 9 Emergency response centre data system and Register of Aliens (1) Provisions on the emergency response centre data system are laid down in the Emergency Response Centres Act (157/2000) and provisions on the Register of Aliens in the Act on the Register of Aliens (1270/1997). Chapter 3 Special provisions on processing personal data Section 10 Processing sensitive data