Washington: Suggesting that India has a sizeable nuclear weapons effort, a US think tank estimated India's nuclear arsenal at around 75-125 weapons made from weapon-grade plutonium and perhaps some thermonuclear weapons.

"India has a substantial stock of nuclear weapons made from weapon-grade plutonium, and perhaps some thermonuclear weapons that rely on both weapon-grade plutonium and weapon-grade uranium," according to the Institute for Science and International Security (ISIS).