Vilas Warack, a gym instructor who met terror suspect David Coleman Headley along with filmmaker Mahesh Bhatt's son Rahul, was questioned on Monday by the National Investigation Agency probing the LeT plot to carry out major strikes in India.

The agency recorded the statement of Warack on how he knew Headley, who was arrested by the FBI in the US last month for planning attacks on the National Defence College in Delhi, Doon school in Dehradun and Woodstock school in Mussoorie, at the behest of LeT, official sources said.

Warack, who worked as an instructor at Moksha Gym frequented by Headley, was asked about the locations the American visited and names of persons whom he met there.

The sources said that Warack was a little nervous but responded to the questions.

The agency had registered a case against Headley for allegedly plotting terror attacks in India, as the Government said it had enough evidence to show he had links with the Pakistan-based Lashker-e-Taiba (LeT).

Headley and Tahawwur Hussain Rana, a US-based Pakistan-born Canadian national, were booked under the Unlawful Activities (Prevention) Act and for conspiring to wage a war against the country.

Warack met Headley at the high profile gym where he was working as an instructor. Warack has admitted to having introduced Headley to Rahul Bhatt.