2 teenagers among 5 killed in crash on northbound 710 Freeway in Long Beach

LONG BEACH, Calif. (KABC) -- Five people, including two 15-year-olds, were killed in a crash on the 710 Freeway in Long Beach, which forced a temporary closure of all northbound lanes Monday morning.

The crash happened shortly after 4 a.m. at the 91 Freeway connector, according to the California Highway Patrol traffic log.

Investigators are trying to determine what caused the single-vehicle crash, but it appears a black Hyundai Sonata was driving at a high speed when it crashed and burst into flames.

Dashcam video of the crash shows the car going down the freeway and collide into attenuators, which Caltrans describes as a group of barrels designed to redirect vehicles away a barrier.

Footage shows the car flip in the air before it's engulfed in flames.

The witness who captured video of crash says she called 911.

A total of six people were in that vehicle, and some of them were ejected upon impact.

Five of them died and another adult was taken to a hospital with major injuries, according to CHP's Angelia Gonzales. Information on that person's condition was not available.

Gonzales said passengers may have not been using their seatbelts.

Two of the victims have been identified as George Dobbs and Ariahh Slemaker, both 15 years old.

All northbound lanes were initially shut down, but a few lanes began reopening around 6 a.m.

The CHP is now urging anybody who may have witnessed the collision to come forward.