The comments by Jim Mattis come as US secretary of state Rex Tillerson has tried to calm fears over the crisis.
North Korea says it will complete plans to attack waters near Guam by mid-August and will await its commander-in-chief's order.
More warnings and threats between US, North Korea
Một ngôi chợ tại Guam, nơi Bắc Hàn đe dọa tấn công Source: AAP
The United States defence secretary has warned North Korea it is risking the destruction of its people, saying it is ''grossly" outmatched in any conflict between the two countries.
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