LONDON — According to the most recent estimates by U.S. intelligence, Pakistan has doubled its nuclear stockpile over the past few years. The nation's arsenal now totals more than 100 deployed weapons.

Pakistan is now ahead of India in the production of uranium and plutonium for bombs and development of delivery weapons. It is now producing nuclear weapons at a faster rate than any other country in the world. Pakistan will soon be the world's fourth-largest nuclear weapons state, ahead of France and Britain and behind only the United States, Russia and China.

Pakistan is investing heavily in plutonium-production capacity with work reportedly under way on a fourth plutonium-producing reactor at Khushab nuclear complex.