The team is India for the probe into the terror attacks last year in India's financial capital Mumbai in which more than 160 people died, Indian Foreign Minister S.M. Krishna said.
"The FBI team is here and we have been assured of all cooperation from the U.S.," Krishna said, the Economic Times-IANS reported.
Charges in the Mumbai attacks were filed Monday in Chicago against Headley, a U.S. national who was arrested in that city in October. U.S. authorities said he allegedly attended training camps in Pakistan operated by the banned Lashkar-e-Toiba terror group and allegedly conspired with the group's members and others in planning and executing attacks in both Denmark and India. The charges against the 49-year-old include conspiracy to bomb public places in India, conspiracy to murder and maim persons in India and Denmark, and aiding and abetting the murder of U.S. citizens in India.
The FBI team held discussions with Indian investigators about Headley and Pakistan-born Tahawwur Rana, who is also in U.S. custody, the Press Trust of India reported.
The PTI report quoted sources that the U.S. investigators assured the Indians they would share more information on the progress of the investigation. Rana's lawyer, reportedly has denied the allegations against his client.
The Economic Times report said Indian intelligence alleges Headley and Rana traveled in India extensively prior to the Mumbai attacks, and that Headley provided maps, photographs and other details to the 10 LeT attackers who reached Mumbai by sea from Karachi.