SEOUL, April 23 (Reuters) - Chinese nuclear experts have warned that North Korea may already have 20 nuclear warheads and the capability to produce enough weapons-grade uranium to double its arsenal by next year, The Wall Street Journal reported.
The Chinese estimates of Pyongyang's nuclear production, relayed to U.S. nuclear specialists, exceed most previous U.S. forecasts, which range from 10 to 16 bombs currently, said the report, which cited people briefed on the matter.
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Experts at the U.S.-Korea Institute at Johns Hopkins University's School of Advanced International Studies earlier this year presented three scenarios for North Korea's nuclear capability, predicting its stockpile of weapons could grow to 20, 50 or 100 within five years.
North Korea has conducted three nuclear detonations, the most recent in February 2013.
Asked about the report at a regular press briefing on Thursday, China's Foreign Ministry spokesman Hong Lei said he "did not have knowledge of the specific situation."
"We must persevere with denuclearisation on the Korean peninsula, persevere in safeguarding peace and stability, and persevere in resolving the relevant issue through dialog," Hong said.
Early this month, U.S. Admiral William Gortney, commander of the U.S. Northern Command and North American Aerospace Defense Command, said the U.S. military believes North Korea has the ability to miniaturize a warhead and mount it on a ballistic missile, although there had been no tests. (Reporting by Tony Munroe in Seoul and Adam Rose in Beijng; Editing by Paul Tait and Simon Cameron-Moore)
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In this June 19, 2014 photo, residents of a small roadside town walk towards the main road in North Korea's North Hamgyong. (AP Photo/David Guttenfelder)
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In this June 19, 2014 photo, a North Korean man pushes his bicycle to a village in North Korea's North Hamgyong province. (AP Photo/David Guttenfelder)
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In this Monday, June 16, 2014 photo, North Korean men ride in a farmer's wagon in North Korea's South Hamgyong province. (AP Photo/David Guttenfelder)
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In this Saturday, June 21, 2014 photo North Koreans walk in front of an apartment building in North Korea's South Hamgyong province. (AP Photo/David Guttenfelder)
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In this June 21, 2014 photo a monument of a fist holding a bayonetted Kalashnikov rifle stands on a roadside in North Korea's South Hamgyong province. (AP Photo/David Guttenfelder)
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In this June 20, 2014 photo, exhaust fumes, like fog, spills out of the long Hamgwan Tunnel near Hamhung in North Korea's South Hamgyong province. (AP Photo/David Guttenfelder)
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In this June 15, 2014 photo, an apartment block stands behind hotel room curtains on the main street in Hamhung, North Korea. (AP Photo/David Guttenfelder)
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In this June 19, 2014 photo, smoke stacks of a factories stand behind a compound wall along a street in the city of Chongjin, North Korea. (AP Photo/David Guttenfelder)
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In this Thursday, June 19, 2014 photo, a North Korean farmer stands in a field at Chanpyong Farm in Taehongdan in North Korea in Ryanggang province. (AP Photo/David Guttenfelder)
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In this Monday, June 16, 2014 photo, a North Korean man driving an ox cart protects himself in a rainstorm south of Hyesan, North Korea in Ryanggang province. (AP Photo/David Guttenfelder)
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