Pakistan is expanding its nuclear arsenal and has developed an estimated stockpile of 130 to 140 warheads for delivery as well as converting some of its fighter jets, including F-16s to deliver nukes, Bulletin of Atomic Scientists said in its latest report.

Authored by Hans M Kristensen and Robert S Norris, the report says that analysis of a large number of commercial satellite images of Pakistan army's garrisons and air force bases shows what appear to be mobile launchers and underground facilities that might be related to nuclear forces.

"Pakistan continues to expand its nuclear arsenal with more warheads, more delivery systems, and a growing fissile materials production industry," said the report on Pakistani nuclear forces, 2016.