Authorities in J&K have imposed strict restrictions in parts of summer capital Srinagar which is already under a thick security blanket ahead of Independence Day.
While India's High Commissioner Bisaria is in Islamabad, his Pakistani counterpart Moin-ul-Haq is yet to take charge in New Delhi.
The college student, a goalkeeper for his local team in Anantnag in south Kashmir, is believed to have turned to militancy after a close friend was killed in an encounter.
The terrorists have been identified as Raqib Ahmad Sheikh, a resident of Shiganpora in Kulgam, and Pakistani nationals Waleed and Numan, a police spokesman said.
In a statement, the ministry of home affairs said the UT of Ladakh consists of two districts of Kargil and Leh while the rest of the erstwhile state of Jammu and Kashmir is in the UT of Jammu and Kashmir.
Border skirmishes witnessed a spurt after India's preemptive air strike.
Khan said Pakistan wants peace with India but will retaliate in case of any "aggression" by the neighbouring country.