An investigation was underway Sunday morning into a car crash in Santa Ana that left one man critically injured, police said.

The crash occurred just before 11:30 p.m. on Saturday at the intersection of West Civic Center Drive and English Street (map), according to Santa Ana Police Department Cmdr. Eric Paulson.
Video from the scene showed a damaged white SUV resting on top of a dark-colored car.
An unidentified man was discovered unconscious at the site of the collision, Paulson said. It was unclear which vehicle he was in.
The man was transported to a local hospital where he was listed in critical but stable condition, according to Paulson.
No other injuries have been reported.
A tank that was “presumably” filled with nitrous oxide was found at the scene, Paulson said.
Authorities have not yet determined whether the tank played a role in the crash.
KTLA’s Geoff Peters contributed to this report.