NEW DELHI: Realty major UnitechBSE -19.86 %slipped 20 per cent in early trade on Tuesday after theCentral Bureau of Investigation (CBI) registered a Preliminary Enquiry (PE) to verify allegations that a public prosecutor in the 2G case was in touch with Unitech managing director Sanjay Chandra.

"The PE was registered on February 6 but became public after a news channel broadcast audio recordings alleged to be between Chandra and the 2G case public prosecutor AK Singh," ET reported.

At 10:00 am, Unitech was trading 19.3 per cent lower at Rs 28.25. It has hit a low of Rs 27.70 and a high of Rs 34 in trade today.

Following the reports, DB Realty also plunged 20 per cent in trade to Rs 98.75. The stock was trading 19.45 per cent lower at Rs 99.50.

"Both AK Singh and Sanjay Chandra were called to theCBI headquarters on Monday and questioned regarding the alleged tapes. Chandra denied all charges during the interaction with CBI officials. The tapes allegedly date from September last year," said the ET report.

However, Unitech strongly denied the allegations and said that Chandra had never spoken to the prosecutor. It claimed that the audio recordings were fabricated.

"Despite the bereavement in his family, Sanjay Chandra has joined CBI's enquiries and has made his stand crystal clear. It is re-iterated that the recording is a fabrication," the statement issued by Unitech on Monday.

The stock was a marked outperformer for the year 2012. Unitech clocked a return on over 70 per cent last year as compared to a 26 per cent gain in the BSE Sensex.