New Delhi: Providing a spine to India’s doubt against Pakistan-based Jaish-e-Mohammad (JeM) handlers’ involvement in Pathankot Indian Air Force (IAF) base terror attack in January this year, a document sent by the United States confirmed the involvement of Pakistan in the attack. 
According to a TOI report, US has handed over the evidence in the form of a dossier of around 1000 pages having chats and conversations to the National Investigation Agency (NIA). The data comprises messages and conversations that took place between handler Kashif Jaan and the four fidayeen who were eventually killed.  
Apart from these, the dossier also includes conversations between Jaan and other Pakistan-based JeM members. 
Also, Jaan was using a Facebook account which was connected to the same mobile number on which the attackers had called from Pathankot after abducting Punjab police SP Salwinder Singh. 
The dossier sent by US is going to act as a major lead for the Indian investigative agency in conducting its investigation in the Pathankot terror attack. NIA, however is presently analysing the documents.