Impairment is suspected as a possible factor in the crash that killed a Santa Rosa teen and seriously injured his passenger early Sunday, according to the California Highway Patrol.

Endrias Atlaw, 18, the driver of the 2004 Honda Civic that slammed into a tree on Highway 1 south of Bodega Bay.

The car appeared “wrapped around a tree,” according to initial reports from witnesses to the crash just before 2 a.m. It was not clear how fast it was going when it left the road just north of Bay Hill Road and Estero Lane.

A passenger, Aleksandra Adamovna Ivanova, 18, Rohnert Park, was airlifted to Santa Rosa Memorial Hospital with a reported broken hip, broken ribs and other injuries. She then was transferred to Stanford Hospital where she remained Wednesday for treatment of several broken bones and other injuries, said her mother, Svetlana Clark of Rohnert Park.

A CHP press release issued Sunday evening said alcohol was suspected as a factor in the crash. The CHP Wednesday said lab tests haven’t been completed and until then, impairment is considered a possible factor as drugs or alcohol intoxication haven’t been ruled out.

This story has been updated to reflect information provided by the CHP and family on Wednesday.

- Staff Writer Randi Rossmann contributed to this report.