The Pakistani agency ISI was allegedly held responsible by India for financing and aiding the militant acts to foment religious disturbances in the state.
Some of the key accused in the attacks are: Khalistan Liberation Force leader Harminder Singh Nihang alias Mintoo was named involved in the killings by the National Investigation Agency.
[29][30] Khalistan Liberation Force future leader Harmeet Singh alias Happy PhD was the mastermind behind the killings.
[31][32] On 4 November 2017, Punjab Police arrested Jagtar Singh Johal alias Jaggi, from Rama Mandi town of Jalandhar and accused him of the attacks.
[39] The Crown Prosecution Service in the UK has stated that the evidence presented by the Indian authorities is "not sufficient to make out a case to answer".