Is the 10th of April kick off day?
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North Korea had warned British diplomats that it cannot guarantee their safety after 10 April in the event of conflict, the Foreign Office has said.
The latest move comes amid spiralling tensions in the Korean peninsula.
The Foreign Office said it was "considering next steps" after the North Korean regime asked if Britain was considering evacuating its embassy.
On Thursday, David Cameron said he was "very concerned" about North Korea.
The UK prime minster cited the nuclear threat posed by the regime led by Kim Jong-un as one of the reasons he was committed to maintaining a round-the-clock submarine-based nuclear missile system.
'Capital is calm'
The Foreign Office says its review of its next move included the possibility of amending travel advice.
But it warned North Korea that it had obligations under the international Vienna convention to protect diplomatic missions and claimed the move was an example of the "continuing rhetoric" against the United States.
Its travel advice currently says North Korea "has made a number of statements which have increased tensions on the Korean Peninsula. These statements follow a satellite launch in December 2012 and suspected nuclear test this February.
"The FCO assess that there there is currently no immediate increased risk or danger to those living in or travelling to the country as a result of these statements."
BBC world affairs correspondent Mike Wooldridge said that although the Foreign Office have not revealed how many staff work in the British embassy, it is believed to be fewer than 20.
Our correspondent reported that Russia had said earlier that it was in close contact with the US, China, South Korea and Japan over the North Korean request to the diplomatic missions and was trying to clarify the situation.
Anecdotal reports from inside the North Korean capital, Pyongyang, say the mood there is calm, and many believe North Korea is deliberately trying to create a sense of crisis, says the BBC's Lucy Williamson in Seoul.
The North has a history of using bellicose rhetoric, but it has been ramped up over the past few weeks, with nuclear strikes and attacks on the US and South Korea threatened.
On Friday, the South deployed two warships with missile defence systems to its east and west coasts, a day after the North apparently moved a missile to its east coast.
North Korea has also announced a formal declaration of war on the South, and pledged to reopen a mothballed nuclear reactor in defiance of UN Security Council resolutions.