TUNIS, Sept 20 (Reuters) - Electricity supplies were cut across Tunisia for two hours on Wednesday but the reason for the rare nationwide outage was unclear, residents and the state electricity company STEG said on Wednesday. The Interior Minister Kamal Feki was headed to the power plant in Rades city to investigate the reasons behind the blackout, his ministry said. Reporting by Tarek Amara, writing by Muhammad Al Gebaly; Editing by Michael PerryOur Standards: The Thomson Reuters Trust Principles.

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Persons: STEG, Kamal Feki, Tarek Amara, Muhammad Al Gebaly, Michael Perry Organizations: Thomson Locations: TUNIS, Tunisia, Rades