India has the option of delivering a 20 kilotonne device from aircraft like MiG, Jaguar and Mirage or ballistic missiles like Prithvi, Dhanush and Agni, the survey, which was released in Washington on Thursday, said.
"It is estimated that India probably has between 50 and 150 nuclear warheads available," it said.
"Analysis from some sources suggests that there is sufficient weapons grade uranium and plutonium available to India to build more warheads," it said.
The survey said Pakistan's program is less advanced, but it probably has between 25 and 50 nuclear warheads.
"Pakistan's planned yield for its larger nuclear weapons design was 20 to 25 kilotonne providing a warhead that would probably be fitted to Shaheen and Ghauri ballistic missiles."
The survey warned that any nuclear conflict between the two nations would be self-defeating, as the bombs would inflict terrible casualties on home populations as well as targeted cities.
"A nuclear strike by either country could turn out to be a pyrrhic victory since, due to the close proximity of several cities on either side of the Indo-Pakistani border, the resulting fallout could easily be blown over the attacking country," it said.
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