In London, Defense Secretary Jim Mattis expressed concern about what he called "reckless" actions by North Korea, alluding to its nuclear weapons and missile programs, the AP reports.

Mattis spoke at a news conference Friday with his British counterpart, Michael Fallon.

Mattis raised the North Korea issue in response to a reporter's question about Iran. Mattis suggested that North Korea is a more urgent problem, the AP said.

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