Article updated at 3:50 p.m. on 7/13:
The three victims in on Route 24 northbound on the Stoughton/Avon line are from Norton, according to Trooper Todd Nolan, a spokesperson for the Massachusetts State Police.
12-year-old Angel Pina was pronounced deceased at the scene of the crash, which took place shortly before 5 p.m. on July 12.
Pina just finished fifth grade at the H.A. Yelle School in Norton, according to a release from the Norton Public Schools. She was scheduled to attend Norton Middle School in September.
Sandra Ouellette, 36, was the operator of the vehicle, a 2004 Chevy Colorado, Nolan said. Ouellette is Pina's mother.
The car rolled over about a quarter mile south of exit 20 (Route 139). The three victims were found lying on the highway when emergency response crews arrived, the Boston Herald reported.
Ouellette was transported to Massachusetts General Hospital with serious injuries, but is expected to survive, Nolan said.
An update on her condition was not available.
The other passenger, Stephanie Rogers, 21, was transported to Boston Medical Center with non-life-threatening injuries. She is also related to Pina and Ouellette.
A BMC spokesperson said Rogers is listed in "good" condition.
WCVB Channel 5 reports that Rogers was 8 months pregnant and the crash caused her to go into labor. .
The official cause of the crash has not been determined, Nolan said, although State Police believe it may be due to a rear tire blowout.
"The investigation suggests that none of the victims were wearing seat belts," State Police stated in a release.
The accident created gridlock on both sides of Route 24 during the evening commute. At one point, traffic was backed up to Route 495 on the northbound side, WBZ reported. The highway reopened Thursday evening, according to the Massachusetts Department of Transportation.