Sajid Hussain, who escaped Balochistan province in 2012 and was living in self-imposed exile, went missing on March 2.
Kiyya Baloch is a freelance Pakistani journalist currently based in Norway.
Members of community, many of whom have family in Xinjiang, say they feel harassed by continuous phone calls.
Analysts say country’s policy of neutrality cements its role as a mediator between the two Muslim powers.
Islamabad has close ties to Riyadh and receives financial aid from the kingdom, but Iran is its next-door neighbour.