A team of Indian intelligence officials left the US disappointed after a week-long stay here 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 Pakistanbased 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-Taiba (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.

Headley's accomplice, Tahawwur Hussain Rana's, a Pakistan-born Canadian citizen arrested on terrorist charges, hearing of bail application has been postponed by a week.

FBI detained Headley and Rana last month on charges of planning terrorist attacks in Denmark and in India, including the prestigious National Defence College in New Delhi.