The Roscosmos corporation announced this on its Twitter page.

"3 ... 2 ... 1 ... START!

The Soyuz-2.1b launch vehicle with the Fregat upper stage and a new batch of 34 OneWeb communication satellites on board was launched from the Baikonur cosmodrome, ”the statement said.

3 .. 2 .. 1 .. START!

🚀



The Soyuz-2.1b launch vehicle with the Fregat upper stage and a new batch of 34 #OneWeb communication satellites on board was

launched

from the # Baikonur cosmodrome.



Broadcast → https://t.co/vwumcVL22Ipic.twitter.com/tRcqtkSHI5

- ROSCOSMOS (@roscosmos) September 14, 2021

It is specified that the separation of the first stage of the launch vehicle has already occurred.

Earlier, the State Commission approved the launch time for Soyuz-2.1b with 34 OneWeb devices.