This is a list of countries that most concern nuclear proliferation experts. Most of them have denied any interest in building a bomb and have said their nuclear programs are for peaceful uses. All quotes are from the Carnegie report.

Argentina has the most advanced nuclear program in Latin America . . . last year revealed development of previously secret enrichment plant that could produce weapons-grade uranium . . . still "several years" from nuclear weapons capability.

Brazil has the "nuclear infrastructure" and scientific know-how to develop weapons but is unlikely to have a source of plutonium or highly enriched uranium until 1990 at the earliest . . . several years behind Argentina.

India detonated a nuclear "device" in 1974 and has since expanded its ability to produce plutonium . . . not believed to have built nuclear weapons but has the know-how and materials.

Iraq was set back when Israel bombed its reactor and has been essentially "dormant" since . . . still may be trying to buy weapons-grade material on the black market, however.

Israel has know-how and materials and probably has built between 10 and 20 Hiroshima-sized bombs . . . Israeli officials have said they do not have the bomb but could produce it quickly.

Libya has tried to purchase nuclear technology from Pakistan, Argentina, the Soviet Union, Belgium and elsewhere, according to reports . . . like Iraq, remains years from having the technology to build the bomb.

Pakistan may be able to produce weapons-grade uranium at its Kahuta enrichment plant, "thereby surmounting the final obstacle on its 12-year quest for nuclear arms."

South Africa is believed to have weapons or be close to producing them . . . can produce highly enriched uranium and may have accumulated enough for 25 Hiroshima-sized bombs.