North Korea said Tuesday it has halted work to disable its plutonium-producing nuclear complex in protest at Washington's failure to remove it from a terrorism blacklist. Authorities are also considering restoring the plants at Yongbyon to their original state, a foreign ministry spokesman told the official (North) Korean Central News Agency. A six-party aid-for-disarmament deal is currently deadlocked by a dispute over verification of the North's nuclear declaration which it delivered in June.