WASHINGTON (AP) Heightened activity detected by spy satellites around a North Korean nuclear plant has American intelligence analysts in disagreement: Is the reclusive communist government rushing to produce nuclear weapons or just bluffing? Throughout January, American spy satellites have detected covered trucks apparently taking on cargo at the nuclear storage facility at Yongbyon, where spent nuclear fuel rods are stored, U.S. officials said Friday on condition of anonymity. When processed, enough plutonium could be extracted from the rods to make four or five nuclear weapons. The U.N. nuclear watchdog has said there are 8,000 rods. White House spokesman Ari Fleischer would not comment on the intelligence, but warned Pyongyang, North Korea