Last month, Pakistan said it had detained the suspected spy, Kulbhushan Jadhav, in the violence-plagued province of Baluchistan after he had illegally entered the country from Iran.

Pakistan says Jadhav was working for India’s main external intelligence agency, the Research and Analysis Wing (RAW).

India has confirmed that the man was a former Indian navy official but denied the man was a spy.

In video footage aired by the Pakistani government this week, Jadhav said he had set up an office in Chabahar in southeast Iran in 2003 and later worked for the Indian agency.

It was not clear if Jadhav made the comments on the video tape freely or under duress.

Pakistan’s interior ministry, in a letter to Iran’s ambassador in Islamabad, Mehdi Honardoost, said the Indian made had made “startling revelations” about an Indian spy network operating against Pakistan from Iranian soil.

“His mission included spying and sabotage, in addition to fomenting insecurity and instability in the provinces of Sindh and Baluchistan,” the ministry said in the letter, a copy of which was provided to Reuters by an Interior Ministry official.

Pakistan asked Iran to provide information about the Indian man’s activities, and the people he interacted with there, the ministry said.

Honardoost was not available for comment.

The Iranian embassy in Islamabad issued a statement on the Friday on the “detention of the Indian agent” and said unidentified “elements” were not happy with good ties between Iran and Pakistan and were trying to undermine them.

Iranian President Hassan Rouhani visited Pakistan last week and signed an agreement to increase annual trade volumes between the two countries to $5 billion by 2021.