Launch of Soyuz 2.1a with Progress MS-07 scrubbed seconds before liftoff

Less than a minute before it was to take to the skies to deliver the Progress MS-07 cargo freighter to the International Space Station, an unknown issue with the Soyuz 2.1a launch vehicle prompted a rare scrub for the Russian space agency’s workhorse rocket. Liftoff was expected at 5:32 a.m. EDT (09:32 GMT) Oct. 12, 2017, from Site 31 at the Baikonur Cosmodrome in Kazakhstan. More

(Source: SpaceFlight Insider - Oct 13)