PHILADELPHIA (CBS) — One man is dead after a single-car crash in Center City Philadelphia.

It happened around 4 a.m. Sunday at 4th and Lombard Streets in the Society Hill section of the city.

Police say a car hit a bump, lost control, slammed into a tree and flipped on its side. Investigators say the 21-year-old driver was ejected and died after being crushed by the car.

Police say three others were inside the car but they were not injured.

Authorities do not believe alcohol or drugs were a factor.