"The Indian High Commissioner was summoned by the Foreign Secretary today and through a demarche conveyed our protest and deep concern on the illegal entry into Pakistan by a RAW officer and his involvement in subversive activities in Balochistan and Karachi," the Pakistan Foreign Office said in a statement.
Balochistan Home Minister Mir Sarfaraz Bugti yesterday identified the "official" as Kul Yadav Bhushan who he alleged was a commander-ranking officer in the Indian Navy and was working for Research and Analysis Wing (RAW).
The Minister, however, did not disclose the exact location of where he was arrested.
However, sources said that Bhushan was arrested from Chaman area of Balochistan, which is close to the Afghanistan border.
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Pakistan had accused India of stoking violence in Balochistan and Karachi in the past but it is for the first time that it has claimed arresting a RAW officer.
(Reopens FGN17)
Pakistan's Interior Minister Chaudhry Nisar Ali Khan said the arrest showed a "foreign hand" was behind unrest in the province, which is Pakistan's largest.