This story has been updated to include additional comments by U.S. Ambassador to the UN Nikki Haley.

The UN Secretary General António Guterres on Sunday condemned North Korea’s latest nuclear test and urged the DPRK to adhere to its international obligations.

The DPRK conducted its sixth nuclear test in the early hours of Sunday morning, with the country’s state media claiming a successful trial of a hydrogen bomb which could fit on an intercontinental ballistic missile (ICBM).

“This act is yet another serious breach of the DPRK’s international obligations and undermines international non-proliferation and disarmament efforts,”  a statement from Guterres’ press office