Hague on North Korean Threat
7 April 2013 Last updated at 11:30 BST
William Hague says Britain has to be "concerned" about the threat from North Korea.
Speaking to Eddie Mair on the Andrew Marr show, the Foreign Secretary says the international response should be "clear, calm and united".
He also stated that he does not intend to move British diplomats from the Pyongyang embassy but that the situation is "under constant review".