The Jammu Kashmir Coalition of Civil Society has several reports on their website (jkccs.net) that are gruesome reading but rigorous investigations by human rights activists. The JKCCS is an invaluable resource for those who want to understand the character of Indian colonial occupation in Kashmir. You can find their February 2019 report on India’s use of torture against Kashmiris by going to their website & accessing their report menu.
jkccs.net