This story was updated on Thurs., Jan. 4 at 5:30 p.m.

A rollover crash on Morrissey Boulevard around 3a.m. on Thursday left two teenagers dead and a third in grave condition, according to State Police, who said that the car they were riding in had been reported stolen that night from Jamaica Plain.

In a statement released on Thursday afternoon, Mass State Police said that one of the deceased was a 14-year-old male from Dorchester.

"The second deceased occupant, also a teenage male, has been tentatively identified; his age and city of residence will not be released until identification is confirmed," the police statement read. The teen who is in grave condition has not been identified yet. A fourth occupant of the car— a 2014 Hyundai— is a 15-year-old Dorchester boy and is expected to survive.

"A firearm was located in the crashed vehicle and was secured by the State Police Ballistics Unit," State Police said.

The incident prompted the roadway to be closed down to motorists this morning as State Police investigated.

The roadway was closed between UMass and Freeport Street and the expressway offramp onto Morrissey was also shut-down as an investigation continued. The scene was cleared and the roadway re-opened around 7:45 a.m., according to state officials, but residual traffic impacts continued.

-Developing story-