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Updated coverage: Officials have identified three of the victims and possible drunken driver in Friday's crash.

A violent collision that killed four people, including two children, in Fontana early Friday afternoon is being investigated as a possible DUI crash, according to the California Highway Patrol.

The crash occurred about 12:35 p.m. on the eastbound 10 near Cherry Avenue, CHP Officer Jesus Garcia said.

A woman was driving a Honda sedan when the car overheated, forcing her to stop on the side of the roadway, he said. Two children and an adult female passenger were also in the car.

While the Honda was stopped, a man driving a Toyota Tacoma pulled in front of her to help, according to Garcia.

As the three adults were standing outside the vehicle, a Nissan Frontier slammed into the Honda, which then collided with the Tacoma, he said.

The crash killed the man, the female passenger, and the two children who were still inside the vehicle when the collision took place. The woman who died is believed to be the children's grandmother, a CHP official told KTLA.

The other two drivers were transported to Arrowhead Regional Medical Center — the Nissan driver with minor injuries and the Honda driver, who was uninjured, because of her hysterical state, according to CHP.

Prior to the deadly crash, the Honda driver had called her husband and son to let them know that her car had broken down on the freeway; when they arrived, they found the three family members dead, Garcia said.

Sky5 aerial video over the violent crash site showed the back of the Honda crushed by the Nissan pickup truck on the shoulder of the freeway; the Tacoma, which had spun out when the Honda hit it, came to a rest near the center divider of the freeway, according to the footage.

Authorities were trying to determine whether the Nissan driver was under the influence at the time of the crash, according to Garcia. He added there was evidence in the vehicle.

A news photographer's video showed a Modelo beer can below the driver's seat in the pickup truck.

Officers were at the hospital interviewing the driver, Garcia said, noting that they wouldn't be able to confirm if it was alcohol-related until further investigation.

A SigAlert was issued after the crash, and lanes were closed for hours. Traffic in the area was jammed amid the investigation and cleanup, aerial video showed.

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