Kempton’s Saturday evening meeting was abandoned with two races remaining after a medical emergency in the stable yard.
It is understood a stablehand was seriously injured after being kicked by a racehorse.
An announcement saying the fixture had been called off was made before the penultimate race at 20:45 BST.
Doctors at the Surrey course attended the emergency, a report from the track stewards said.
A statement from Kempton said: “This evening’s fixture has been abandoned due to an incident at the stable yard.”