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.

"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.

According to the scientists, with several delivery systems in development, four plutonium production reactors and its uranium enrichment facilities expanding, Pakistan's stockpile will possibly increase further over the next 10 years.