A man suffered major injuries after crashing his car into a tree early Sunday morning in San Luis Obispo, police said.

About 4 a.m., officers and firefighters found the driver unconscious along South Higuera Street just north of Tank Farm Road, according to a San Luis Obispo Police Department news release.

Firefighters got the driver out, and he was being treated at Sierra Vista Regional Medical Center in San Luis Obispo.

Investigators closed a part of South Higuera Street about four hours.

They haven’t determined what caused the crash, and police said the driver has not been identified.