Pakistani investigators must also probe whatever role senior military and political leaders may have played.

Pakistani investigators were present but did not question him, he said.

Pakistani investigators have confirmed that the original asking price for the documents was $10 million.

While the Times inquiry confirmed some of the allegations made by the Pakistani investigators, other matters remained unresolved.

The detention of the intelligence agency officers is a rare but not unprecedented pressure tactic by Pakistani investigators.

But some Pakistani investigators felt that the mission was personal.

Pakistani investigators insist that some $500 million has been uncovered in 19 Swiss bank accounts.

But while 11 scientists and military staff officers have been questioned, Pakistani investigators have not spoken to the general.

A July 2009 report from Pakistani investigators confirmed that LeT was behind the attack.

"When it is with the police, everything leaks out," said a Pakistani investigator who has worked with both agencies.