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Astronauts begin International Space Station repairs

22 December 2013 Last updated at 02:03 GMT

Astronauts at the International Space Station have completed the first of a series of spacewalks to carry out urgent repairs.

Two Americans astronauts conducted the first of three possible spacewalks needed to mend the station's critical cooling system - half of which automatically shut down last week after detecting abnormal temperatures.

Nasa said the situation was potentially serious but not life-threatening.

Denise Hammick reports.