A Pakistani embassy official was questioned and two Indian nationals were arrested on alleged espionage charges and working for the ISI, a police officer said here on Thursday.

Mehmood Akhtar, the Pakistan official in the High Commission, was briefly detained and let off because of diplomatic immunity, the police officer told IANS on condition of anonymity.

However, the two Indians, identified as Maulana Ramzan and Subhash Jangir, both residents of Rajasthan, were still being questioned for working with the Inter-Services Intelligence (ISI).

The arrests were made late Wednesday night by the interstate cell Crime Branch following a tip off from the Intelligence Bureau, sources said.

This is not the first time that employees of the Pakistan High Commission have come under the radar over alleged espionage in India.

Last years, police claimed to have busted an ISI spy ring in the high commission and five persons were arrested.