"Recently one case has come to our notice. It is suspected that it may be linked to a person under watch. I cannot divulge further details," Finance Minister P Chidambaram said.

He was answering a pointed question by BJP member Ravi Shankar Prasad who asked whether the government is aware of money being poured into the stock market by terrorist outfits.

Prasad said National Security Advisor M K Narayanan had also raised concern over possibility of markets being used by terrorists.

The share market has witnessed a sharp rise over the last few months with the Sensex touching the 20,000 mark.

The rally has been mainly led by Foreign Institutional Investors (FIIs) who have brought in nearly 68 billion dollars (65.18 billion dollars through equity and 2.7 billion dollars throught debt) till November 29, 2007.

Commenting on the issue of ban on Participatory Notes, the Finance Minister said the decision in this regard by the Securities Exchange Board of India (SEBI) was taken on October 25, 2007 in consultation with the government and the Reserve Bank of India (RBI).

He said Participatory Notes have been in vogue for many years. The FII is one of the ways of inflow of funds and there are many other instruments.