An American who helped plan the 2008 Mumbai terrorist massacre has backed claims that Pakistan was heavily involved.
David Headley, who pleaded guilty in a US court to laying the groundwork for the attack, told Indian interrogators that officers from Pakistan's Inter-Services Intelligence agency were deeply intertwined with the Lashkar-e-Taiba group responsible for the killings.
The attack left 166 people dead, paralysed India's business capital and froze peace efforts between Pakistan and India.
The Pakistani spy agency provided handlers for all the top members of the group, gave them direction and provided their funding, Headley said, according to records of his interrogation obtained by the Associated Press news agency.
"According to Headley, every big action of LeT co-ordination is done in close co-ordination with ISI," the report said, using a common abbreviation for Lashkar-e-Taiba.
India has long accused the Pakistan spy service of being involved with, and in some cases directing, terror groups. In July, just weeks after the interrogation, Indian Home Secretary GK Pillai caused a row ahead of high-level India-Pakistan talks when he accused the Pakistani agency of orchestrating the Mumbai attacks. He cited Headley as the source of the information.
A senior intelligence official in Pakistan said the allegations were baseless.
US officials have also accused the spy agency of working with the Taliban to co-ordinate attacks on Nato forces in Afghanistan.
In 34 hours of interrogation from June 3 to June 9, Headley described for Indian officials a Lashkar-e-Taiba organisation that was filled with former Pakistani army officers and veterans from the conflicts with India over Kashmir, the report said.
The report said that at one point at Lashkar-e-Taiba training camp, Headley was drilled by a Pakistani army instructor in intelligence basics, including how to cultivate sources and take cover.