The United States and Japan have said it is unfortunate that North Korea has missed its December 31st deadline to declare that its Yongbyon nuclear reactor has been disabled.
The country had agreed to disable the reactor in exchange for fuel aid and diplomatic concessions.
Today's deadline was due to end the second part of the nuclear deal which was agreed at talks last February.
The other nations involved in the programme are China, Russia and South Korea.
Earlier this month, U-S President George Bush sent a personal letter to the North Korean leader Kim Jong-il, urging him to honour the pledge made at the six-party talks.
Hi: 18°C / Lw: 13°C
Nadal powers to title after epic win over Federer
Revealed: Ulster's most dangerous roads
Hammond and May refuse to sign new contracts
Deputy First Minister in Baghdad for peace mission
Thomas Beattie gives birth to healthy baby girl
Iran warns: attack us and we'll strike you back
Visting the city? Check out our guide to the capital
Swimsuit photo shoot in buildup to Vietnam final
Mandela honoured with the class of 2008
Video tribute as Queen's honours James Ellis
Supporters that made Euro 2008 one to remember
Fashion of the wives throughout the tournament
Pop princess Minogue wows fans at Odyssey gig
Try your luck in our GAA 'pick the score' competition
Looking forward to the famous biking event
Ship's Belfast beginnings celebrated in exhibition
Applauding Ulster's most exceptional women
Special report on Northern Ireland's worst house fire
Celebrating excellence at the inaugural awards gala 
Special multimedia report on Belfast Wheel