This was reported on the NASA Twitter page.

LIFTOFF! @ SpaceX's In-Flight Abort Test began at 10:30 am ET with liftoff from Launch Complex 39A at @NASAKennedy on a mission to show the #CrewDragon spacecraft's capability to safely separate from the rocket in the unlikely event of an emergency. Watch: https://t.co/vjbZFBIMHDpic.twitter.com/o0qtQvYBhx

- NASA (@NASA) January 19, 2020

It is noted that the purpose of the launch is to test the crew evacuation system in case of an accident.

Earlier it became known that the Falcon 9 launch vehicle successfully launched a new batch of 60 Starlink telecommunications satellites into low Earth orbit.