A spacewalk has been canceled after a leak was discovered on a Soyuz capsule

In this handout provided by NASA the International Space Station is seen from NASA space shuttle Endeavour after the station and shuttle began their post-undocking relative separation in 2011. (NASA/Getty Images)

A planned spacewalk by two Russian cosmonauts has been called off after ground teams noticed a significant leak from one of the spacecraft docked at the orbiting International Space Station.

The leak originated from the Russian Soyuz spacecraft, spewing a liquid into space for several hours. NASA later said the liquid was coolant.