Washington : Pakistan-born Canadian Tahawwur Rana's terrorism trial revealed the impunity with which officers in Pakistan's Inter-Services Intelligence (ISI) and terrorists  operate jointly in Pakistan, according to an investigative news group.

The case also showed how a growing number of serving and former Pakistani military officers put their lethal talents at the service of Lashkar-e-Taiba terror group which was behind the 2008 Mumbai attacks, Al Qaeda and other groups, it said analysing the implications of the trial that ended Thursday. 

Confessed American terrorist and Pakistani spy David Coleman Headley delivered explosive revelations about how ISI officers funded, supported and directed the 26/11 Mumbai attacks along with the LeT. 

The trial also left enduring mysteries, ProPublica said noting it did not answer questions about whether Sajid Mir, a Lashkar mastermind who was caught on tape directing the slaughter in Mumbai on phone, was once a Pakistani military officer.

It did not explore the extent to which ISI chiefs beyond Headley's handler, known as Major Iqbal, were aware of the Mumbai plot.  Headley testified that he believed top ISI leadership was not aware, but he also said he thought Iqbal's commanding officer and his unit of the spy agency knew all about the operation, the investigative group noted. 

Washington has been pressing Pakistan for more than a year to arrest Major Iqbal as well as Mir and a half-a-dozen other Lashkar chiefs who have been implicated as masterminds.

Despite abundant evidence and the US federal indictment, the Pakistan government has not pursued those fugitives. They are not anyway hiding and still continue to be involved in terror plotting, it said citing US investigators.  Lashkar is simply too powerful and too close to the Pakistani security forces, according to Western and Indian counter terror officials cited by ProPublica.