Dec 14 (Reuters) - A routine spacewalk by two Russian cosmonauts aboard the International Space Station (ISS) was called off as it was about to begin after flight controllers noticed a stream of particles spewing from a docked Soyuz spacecraft, a NASA webcast showed.
NASA said none of the seven members of the current International Space Station (ISS) crew - three Russian cosmonauts, three U.S. NASA astronauts and a Japanese astronaut - were thought to be in any danger.
The spacewalk planned for Wednesday was postponed once before, in late November, because of faulty cooling pumps in the cosmonauts' spacesuits, Navias said.
The spacewalk was to be the 12th this year at the ISS and the 257th in the history of the 20-year-old platform.
Spacewalks are typically done for space station assembly, maintenance and upgrades, according to NASA.