NASA has placed astronauts aboard the International Space Station (ISS) on an evacuation alert due to a worsening air leak in a Russian module. Crew members are instructed to shelter in their spacecraft.

NASA ordered astronauts aboard the International Space Station (ISS) to shelter in their spacecraft and prepare for a possible evacuation on Friday after an air leak in the Russian module of the orbiting laboratory worsened, raising fresh concerns over a long-running technical problem.