India's Defense Minister Pranab Mukherjee says a detailed investigation will be conducted to bust what he called "a Pakistani spy ring" in the Indian army.

His remarks follow the arrest of two army men last week on charges of spying and handing over secret documents to Pakistan's military spy agency known as the ISI (Inter-Services Intelligence). Islamabad denies the allegation.

Mukherjee said the first step will be to unearth the network which the ISI has developed inside the Indian army.

India and Pakistan routinely accuse each other's diplomats of spying and expel them.

The latest development comes ahead of next month's peace talks, which are aimed at reviving the almost three-year old peace process. It was derailed in July after India accused the ISI of involvement in train bombings in Mumbai, formerly known as Bombay.

Some information for this report was provided by AFP and Reuters.