North Korea: Test was 'first response' to 'US threats'

A protester burns a picture of Kim Jong-un in South Korea's capital Seoul. Credit: REUTERS/Kim Hong-Ji

North Korea said its nuclear test was the "first response" to "US threats" and warned if hostilities carried on it would continue with "second and third measures of greater intensity."

The country's Foreign Ministry said in a statement that the test was a "self-defensive measure" that does not violate any international law.