Bianca Williams, of Chicago, lost control of her 2006 Pontiac Torrent while travelling south on Interstate 89 in West Lebanon, N.H., on September 7, 2016. Williams' SUV was struck by another SUV and she is hospitalized with life-threatening injuries. (New Hampshire State Police photograph)
Bianca Williams, of Chicago, lost control of her 2006 Pontiac Torrent while travelling south on Interstate 89 in West Lebanon, N.H., on September 7, 2016. Williams' SUV was struck by another SUV and she is hospitalized with life-threatening injuries. (New Hampshire State Police photograph)

Lebanon — A 27-year-old Dartmouth medical school scholar was listed in critical condition Thursday after the car she was driving hit a guardrail on Interstate 89 and then was struck by another vehicle, New Hampshire State Police said.

Bianca Williams was driving a Pontiac SUV southbound on Interstate 89 near the West Lebanon exit around 10:30 p.m. Wednesday when she “was distracted for an unknown cause,” according to a State Police news release issued Thursday.

She lost control of her vehicle and struck the guardrails off the travel lane, and the SUV then “rolled back into the travel lane” where it was hit broadside by a BMW SUV being driven by Peter Tourin, 76 of Jericho, Vt.

Williams, a Chicago native who is an urban health scholar at Dartmouth’s Geisel School of Medicine, was taken to Dartmouth-Hitchcock Medical Center with “life-threatening injuries,” the release said.

She was listed in critical condition on Thursday, the hospital said Thursday afternoon.

Tourin and his passenger, Jean Twombly, 75 of Springfield, N.H., were also taken to DHMC with “non-life threatening injuries,” police said.

The interstate south of Exit 20 was shut down for about three hours, police said, and southbound traffic was detoured at Exit 20 south during the crash investigation.

The accident remains under investigation, and anyone with information is asked to call Trooper Derek Myrdek at 603-223-8944.