International Space Station astronauts under evacuation orders over air leak

Nasa says Russian crew trying to fix worsening air leak in its portion of orbital laboratory

• International Space Station air leak: latest updates

Astronauts onboard the International Space Station have been ordered to shelter in their spacecraft and prepare for potential evacuation as a Russian crew attempts to fix a worsening leak of air in its portion of the orbital laboratory, Nasa has said.

The four astronauts of Nasa's Crew-12 mission on the station - two US astronauts, a French astronaut and a Russian cosmonaut - got orders from Nasa mission control at 9.04am ET (2pm BST) on Friday to enter their Crew Dragon spacecraft docked to the station and don their spacesuits in case the air leak warranted an emergency evacuation, a Nasa official said.