I am sure things will be investigated and more proof will be available ... as of now the only thing they have mentioned is that one of the attackers caught alive "claims" to be from Pakistan. So what do you want them to say .......... he says he is Pakistani but we are looking for proof !!!!!!!!!!
Doesn't it make you wonder that the "ISI agents" who were so trained that they not only avioded all Indian security checks, LITRELLY WALKED IN and sieged one of the largest cities in the world, successfully killed ENCOUNTERS SPECIALIST in 1st wave, STILL holding on grounds in two hotels despite Black cats and army is conducting operation from over 7 hrs now, and yet one of them couldn't hide his real identity for few hrs!
The story doesn't match with the ground realities, on the other hand if OTHER methods were used, then he will also admit killing Indra Gandhi if the INVESTIGATORS want him to admit that.