ARVADA, Colo. (CBS4)- An early morning crash Thursday on a ramp from Interstate 70 to Wadsworth in Arvada left six people injured, one of them critically.

Police rushed to the one car rollover at about 1:40 a.m. to the on ramp from eastbound I-70 to northbound Wadsworth.

Six people were inside the vehicle ranging in age 13 to 29. One female, 29, was still listed in critical condition at 2 p.m. Thursday.

The others were treated and released from Denver Health Medical Center and Lutheran Medical Center.

(credit: CBS)

The 20-year-old driver was taken into police custody.

Police believe alcohol may have been involved. They are awaiting results of blood alcohol tests to determine the course of the investigation.