Islamabad: A day after security forces claimed the arrest of a "serving RAW officer", Pakistan on Friday summoned Indian High Commissioner Gautam Bambawale to lodge a strong protest over "India's spying activities" in Balochistan and Karachi, the Foreign Office said. A man believed to be a serving officer in the Indian Navy and a member of the Indian intelligence agency Research and Analysis Wing was arrested during a raid in Balochistan, Dawn online reported. The spy was linked to separatist elements in Balochistan and involved in acts of sectarian terrorism and terror attacks in Karachi, a security official said. The officer was shifted to Islamabad for interrogation as he was suspected of being involved in various acts of terrorism in the province, the official said. Foreign Office sources said that Bambawale was summoned by Foreign Secretary Aizaz Chaudhry, who shared details of the man's arrest with the Indian High Commissioner. Chaudhry lodged a strong protest over the officer's spying activities in Balochistan and Karachi, making it clear that this was unacceptable, the sources said.