U.S. Secretary of Defense James Mattis on Sunday said Washington’s military response would be “massive” if North Korea threatened the United States, Guam or its allies.

The comments follow a successful North Korean nuclear test which took place in the early hours of Sunday morning (EST). The DPRK claimed it detonated a hydrogen bomb small enough to be mounted on a missile.

“Any threat to the United States or its territories including Guam or our allies will be met with a massive military response—a response both effective and overwhelming,” Mattis said at the White House.

“We are not looking to