In plain language, it blew up.
There are no repeated casualties:
An accident Saturday during an abort engine test on a Crew Dragon test vehicle at Cape Canaveral sent a reddish-orange plume into the sky visible for miles around, a setback for SpaceX and NASA as teams prepare the capsule for its first mission with astronauts.
SpaceX is testing the Crew Dragon ahead of the capsule’s first test flight with astronauts later this year, following a successful Crew Dragon demonstration mission to the International Space Station in early March.
SpaceX confirmed the accident, first reported by Florida Today, in a statement Saturday evening. No injuries were reported.
“Earlier today, SpaceX conducted a series of engine tests on a Crew Dragon test vehicle on our test stand at Landing Zone 1 in Cape Canaveral, Florida,” a company spokesperson said. “The initial tests completed successfully but the final test resulted in an anomaly on the test stand.”
The red plume in the photo is from the nitrogen tetroxide propellant.