REACTORS: 5-megawatt facility in Yongbyon capable of producing plutonium, which can be weaponized to make nuclear bombs, was shut down in July 2007 as part of a disarmament-for-aid deal. In April, North Korea said it would restart its atomic program and reprocess spent fuel rods.

RADIOACTIVE MATERIALS: North Korea is believed to have produced up to 110 pounds (50 kilograms) of weaponized plutonium - enough for half a dozen or more bombs. Reprocessing 8,000 additional spent nuclear fuel rods in storage could yield enough weaponized plutonium for yet another bomb. In September, North Korea said reprocessing of spent fuel rods was in the final phase.

North Korea also admitted to having a uranium enrichment program, which would provide a second way to make atomic bombs.

NUCLEAR TESTS: North Korea conducted an underground test of a nuclear device in October 2006, and a second test this May. However, experts say North Korea has not mastered mounting the device on a long-range missile.

MISSILES: North Korea has "Rodong" missiles with a range of about 800 miles (1,300 kilometers) - far enough to reach Japan - and Scud-type, short-range missiles that could reach South Korea. Also has fielded intermediate-range ballistic missiles that can travel at least 1,860 miles (3,000 kilometers) and has test-fired a Taepodong-1 missile with an estimated range of 1,550 miles (2,500 kilometers).

Also believed to be developing a Taepodong-2 missile with potential range more than 4,100 miles (6,700 kilometers), and a new missile with an even longer range that could potentially put Hawaii, Australia and Eastern Europe within striking distance.