In a major security breach, a woman masquerading as a trainee IAS officer stayed at the prestigious Lal Bahadur Shastri Administrative Academy in Mussoorie, a place among top targets of terrorists, for over six months without the knowledge of the authorities.

The civil service recruits training academy learnt about the woman and her prolonged stay at the institute when she had already left on March 27, said Dehradun SSP Pushpak Jyoti.

The matter came to light when administrative officer of the institute Satyavir Singh lodged an FIR in this connection at Mussoorie police station yesterday, the SSP said.

According to the FIR, the woman hailing from Muzaffarnagar in Uttar Pradesh arrived at the academy on September 20 and introduced herself as Ruby Chaudhry, a trainee IAS officer and stayed there for a little over six months before mysteriously disappearing on March 27, the official said.

The SSP said a special team headed by Mussoorie police inspector Chandan Singh Bisht has been constituted to find out how the woman gained entry into the high security academy and managed to stay there for so long without the knowledge of the authorities.

During her stay at the academy she frequented the library.

Documents seized from the room where she stayed are being closely investigated, police said adding that the team constituted by Uttarakhand police will first interrogate Satyavir Singh who lodged the FIR in this connection.