India, May 21 -- More than a decade before Haryana-based YouTuber Jyoti Malhotra's arrest for allegedly leaking military secrets to Pakistan, India was shaken by a similar breach from within diplomatic ranks.

During her posting in Islamabad in 2010, Madhuri Gupta, an Indian Foreign Service (IFS) officer, was arrested for passing classified secrets to Pakistan's ISI, triggering a major espionage case.

Amid intense tensions between India and Pakistan in the backdrop of the 26/11 Mumbai terror attacks, Indian intelligence agencies in early 2010 received alarming signals of a possible mole within the High Commission in Islamabad, NDTV reported.

The alerts prompted the then Intelligence Bureau (IB) chief Rajiv Mathur to initiate a quiet but...