A deliberate spacewalk by means of two Russian cosmonauts aboard the World House Station has been cancelled after challenge controllers spotted leakage from a docked Soyuz spacecraft.

A ‘visual circulation of flakes’ used to be first seen about 7.45pm EST (0045 UK Thursday) prompting Russian flight controllers to abort the challenge, a Nasa livestream confirmed.

Footage confirmed a torrent of snowflake-like debris spraying from the rear phase of the tablet