Pakistani spy agency ISI was actively involved at every stage in the 26/11 Mumbai terror attack, described as "the most important terror attack since 9/11", according to a top counter-terrorism  expert.

 

 "The attack was intended to change dramatically the future of South Asia, perhaps even by provoking a war between the two nuclear powers in the subcontinent," says Bruce Riedel, a former Central Intelligence Agency (CIA) analyst.

 

 Pakistan-based Lashkar-e-Taeba group (LeT) had carefully chosen the targets and meticulously researched them over several years, he wrote in The Daily Beast, an American news reporting and opinion website.

 

 "They received considerable assistance in doing so from two sources – the Pakistani intelligence service, called the Inter-Services Intelligence Directorate or ISI, and Al Qaeda."

 

 "Each had its own agenda for the operation. But the targets were the same –  Indians, Americans and Jews – the targets of the global jihad started by Al Qaeda in the late 1990s," Riedel wrote.

 

 Riedel, who has advised four US presidents on South Asian issues, says he had pointed this out to then "President-elect Barack Obama and his transition team at the time in several briefings in my role as South Asia transition director after his election".

 

 Describing the November 2008 attack as "the most important terror attack since 9/11", he pointed out that the "10 terrorists' tactics have been copied  by others since — for example, just weeks ago in Nairobi".

 

 But "perhaps the most shocking element of the Mumbai attack was the role played by David Coleman Headley, an American citizen of Pakistani descent, in the intelligence collection that preceded the attack", Riedel wrote.

 

 Born Daood Sayed Gilani in Washington, DC, in 1960, Headley changed his name at the behest of LeT to hide his Pakistani identity when travelling abroad.

 

 In his guilty confession, Headley, Riedel noted, acknowledged "the raid also was planned with active ISI involvement at every stage". 

 

 "At each of his  meetings in Pakistan, he said he met with ISI officers as well as the LeT terror leaders," he stated.

 

 "Sometimes the ISI gave him particular assignments separate from what the LeT asked — for example, tasking him with taking photos of an Indian nuclear facility near Mumbai. The ISI also provided him with money to help set up his cover story in Mumbai, including an initial $25,000 in cash," Riedel said.

 

 "Headley also said the ISI provided some of the training for the attackers, including from elite Pakistani naval commandoes. According to Headley, the ISI was especially pleased with the choice of the Jewish Chabad House as a target."

 

 Yet "the Pakistani mastermind of the Mumbai plot, LeT leader Hafiz Saeed, remains free in Pakistan, where he continues to be a darling of the ISI and regularly calls for more attacks on India and America", Riedel wrote noting that "five years after Mumbai, justice has yet to be served".