North Korea seen testing engine for intercontinental ballistic missile

North Korean leader Kim Jong Un (C) guides the multiple-rocket launching drill of women's sub-units under KPA Unit 851, in this undated photo released by North Korea's Korean Central News Agency (KCNA) April 24, 2014. REUTERS/KCNA

SEOUL (Reuters) - North Korea has recently conducted engine tests for an intercontinental ballistic missile that could potentially deliver a nuclear warhead to the United States, a U.S. think tank said on Friday.

North Korea conducted at least one engine test for the KN-08 missile in late March or early April, the think tank 38 North said, marking the latest in a series of tests for a missile believed to have a range of more than 10,000 km (6,000 miles).