New Delhi, The US has handed over proof confirming that the strike originated from Pakistan in the Pathankot terror attack case.

And also, the NIA is examining the option of filing a chargesheet against Jaish-e-Mohammed chief Masood Azhar in the Pathankot terror attack case.

The NIA has been informed by the US that IP addresses of Facebook accounts of JeM handlers who masterminded the January attack and IP address of the website of the outfit's financial arm, Al Rahmat Trust, are located in Pakistan.

As per the investigation, groups accessed by friends of JeM handler Kashif Jaan were related to jihad and JeM and contained photos of the four killed terrorists - Nasir Hussain, Hafiz Abu Bakar, Umar Farooq and Abdul Qayum.

According to an official, "The US has confirmed that all these websites and IP addresses originated in Pakistan and these were uploaded around the time of the Pathankot attack".

The terrorists had also called another number in Pakistan connected to the FB account of Mulla Daadullah.

Around the time of attack, these accounts were accessed using IP addresses of Pakistan-based telecom firms (Telenor and Pakistan TeleCommunications Company Ltd).