Astronauts trace air leak to Russian side of space station after midnight alarm

Nasa officials stress that the leak on ISS remains small and poses no danger but will send extra air supply on the next delivery

A small air leak at the International Space Station finally has been traced to the Russian side, following a middle-of-the-night search by astronauts.

Nasa said on Tuesday that the two Russians and one American on board were awakened late Monday to hurriedly seal hatches between compartments and search for the ongoing leak, which appeared to be getting worse. It was the third time in just over a month that the crew had to isolate themselves on the Russian side, in an attempt to find the growing leak.