A team of Indian intelligence officials left the US disappointed after a week-long stay in Washington as they could not question American national David Coleman Headley, arrested by the FBI on charges of plotting a major terror attack in India at the behest of Pakistan-based LeT.

Sources familiar with the visit of the Intelligence Bureau (IB) and Research and Analysis Wing (RAW) officials termed "bureaucratic" and "procedural" hurdles as the main reason for them not being successful in interrogation of Headley, who is now lodged in a Chicago jail.

49-year-old Headley, according to the FBI charge sheet, was being used by the Lashkar-e-Toiba (LeT) to target among others the National Defence College in New Delhi, the Doon school in Dehradun and Woodstock school in Mussoorie.

The Indian team, names of its members have not been revealed to the media so far, arrived in Washington on November 1 and was scheduled to grill Headley the next day.

However, the Indian team is believed to have spent most of their time in Washington and they could not make their planned trip to Chicago - where Headley and his co-conspirator Tahawwur Hussain Rana are lodged in a jail - to interrogate the duo, both Chicago-residents.

The team left for India through New York on November 8.

In Washington, officials familiar with the investigations said that the Indian officials had a series of meetings with their FBI counterparts during which the American intelligence officials shared their investigation and interrogation details with them.

However, the Indian team wanted to question Headley on different aspects of the terror plot. The officials were disappointed that they were not able to interrogate either of the two arrested, given that this was the prime objective of their trip, the sources said.

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