A report by American nuclear scientists say Pakistan is increasing it's nuclear arsenal. According to the prestigious ' Bulletin of Atomic Scientists', Islamabad's nuclear weapons stockpile now includes around 70-90 nuclear warheads, compared to 60 earlier.
It says the nuclear-capable Shaheen-II medium-range ballistic missile may be deployed soon while two types of nuclear-capable cruise missiles are also under development.
Two new plutonium production reactors and a second chemical separation facility are also under construction.
US scientist Hans M Kristensen has also written about at least three known attacks on Pakistani nuclear facilities, the last being in August 2008 when Taliban suicide bombers tried to destroy an armament complex at the Wah cantonment. But senior US officials claim the weapons were secure.
Meanwhile, America has admitted reports that US-made Harpoon missile may have been modified by Pakistan, even as Islamabad has agreed for "mutual inspections".
The US has taken "very seriously" the reports about illegal modifications made to the Harpoon anti-ship missile.
US has said they have raised the issue with Pakistan, and that it has responded by agreeing to a mutual inspection.
Earlier, a report in the New York Times said that the Obama administration had made a diplomatic protest to Pakistan's Prime Minister Yousuf Raza Gilani over the alleged alterations to the anti-ship missiles Islamabad bought in the 1980s, thus making them capable of hitting land based targets and posing a threat to India.
