South Korea’s defence ministry on Monday said it predicts that North Korea is planning to stage more ballistic missile launches, possibly including an intercontinental ballistic missile, after its nuclear test a day earlier.

The defence ministry was called by parliament on Monday to answer questions about North Korea’s sixth and largest nuclear test on Sunday.

North Korea said an advanced hydrogen bomb for a long-range missile was tested on Sunday, prompting the warning of a “massive” military response from the United States if it or its allies were threatened.

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Officials said activity around missile launch sites suggested North Korea planned further provocations.

The acting Deputy Minister of National Defense Policy, Jang Kyoung-Soo, said: “We predict that North Korea could fire an intercontinental ballistic missile to show that they have obtained the means of delivering a nuclear (bomb) to the United States.

“In cooperation with the United States, we will deploy strategic military assets including a carrier strike group and strategic bombers.”