Earlier in the day, South Korea's Joint Chiefs of Staff said as quoted by local media that the North fired a ballistic missile from a submarine off the country's east coast.
"This latest provocation, yet another violation of UN Security Council Resolutions, underlines the threat that North Korea presents to regional and international security. In conducting this test, North Korea has again shown its blatant disregard for its international obligations and the UK will be working on a strong multilateral response through the UN and EU," Hammond said in a statement.
Last month, North Korea launched five short-range missiles, which landed in the Sea of Japan. South Korean President Park Geun-hye ordered the country’s officials to be prepared to deter potential "reckless provocations" from the North.