US national David Coleman Headley, nabbed by FBI for plotting a major terror attack in India at LeT’s behest, was a frequent flyer who made multiple trips to Pakistan where he spent “substantial time” undergoing training from the terror group, American investigators have said.

Headley (49) was arrested on October 3 along with Tahawwur Hussain Rana, 48, a Canadian citizen of Pakistani origin, by FBI at Chicago’s O’Hare International Airport as he prepared to board a flight to Philadelphia, intending to travel to Pakistan.

According to the FBI affidavit to the US District Court of Illinois, Headley at times has claimed to be a consultant with or representative of First World Immigration Services, a company owned and operated by Rana. Surveillance of Headley’s activities as well as his phone conversations and e-mail exchanges, reflect that he performed few services for First World.

“Headley has no known or reported employment other than with First World. His residence in Chicago is an apartment leased to an individual who is deceased,” the affidavit says. “Notwithstanding his apparent lack of financial resources and substantial employment, Headley has engaged in extensive international travel since the second half of 2008,” it says.