N.Korea 'Has Built 10 More Nukes'

North Korea has produced about a dozen more nuclear weapons over the past year, a Swedish think tank speculates.

In a report on Monday, the Stockholm International Peace Research Institute estimated that the North had 20 to 30 nuclear warheads as of January this year, an increase of about 10 over last year's estimated number.

It said the North "continues to prioritize its military nuclear programme as a central element of its national security strategy, although in 2018 it announced a moratorium on the testing of nuclear weapons as well as medium- and long-range ballistic missile delivery systems."

Worldwide there were a total of 13,864 nuclear weapons as of January, down 601 on-year, it added.

Yet U.S. President Donald Trump, asked by ABC News on Sunday if the North is still building nuclear weapons, said, "I don't know" and added, "I hope not."

North Korean leader Kim Jong-un, "promised me he wouldn't be testing" nuclear weapons, he added.