Endeavour astronauts do first space walk

NASA announces the two astronauts have successfully installed a truss segment during six hours of work on Saturday.

Two astronauts from the crew of US shuttle Endeavour completed their first space walk of a scheduled 11-day mission to expand the International Space Station (ISS).

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Astronauts Rick Mastracchio of the US and Canadian Dave Williams successfully installed a truss segment during six hours of work on Saturday, the US space agency NASA announced from mission control in Houston.

The truss, which is designed to hold a new solar panel, was part of the shuttle's payload.

During the space walk, a computer onboard the ISS failed, and a backup system immediately kicked in. There was no immediate explanation for the problem, which did not hinder the installation work outside the orbiting space station.

Further space walks are planned during the Endeavour mission to continue ISS construction work.