The launch took place at 17.10 GMT with a 30-minute delay and was aired by the Arianespace company which manages to the spaceport.
In around 121 minutes after the start, two satellites are supposed to separate from the rocket, and the two remaining in another 21 minutes.
A Russian-built Soyuz rocket is set for launch at 1637 GMT (11:37am EST) Friday from French Guiana, carrying four new O3b broadband Internet satellites. Live coverage: https://t.co/9U0Iz5MCwi pic.twitter.com/yTUuv041CW— Spaceflight Now (@SpaceflightNow) March 9, 2018
— Claire Mainstone (@plumsahoy2016) March 9, 2018