SpaceX aborted the planned launch of two of SES' O3b mPOWER communications satellites just before liftoff on Monday evening (July 21). The company will try again tomorrow (July 22).

SpaceX aborts satellite launch 11 seconds before liftoff (video)

Source: space
Source Link: https://www.space.com/space-exploration/launches-spacecraft/spacex-aborts-satellite-launch-11-seconds-before-liftoff