A 16-year-old East Palo Alto boy was fatally shot in the head by another passenger inside a Ford Expedition the morning of June 12 in Redwood City, according to police.

It is not yet known whether the shooting was intentional, police Lt. Sean Hart said. The victim has been identified by the San Mateo County Coroner’s Office as Armando Juan Carranza.

In their investigation, police identified three other people in the Ford Expedition, all males between the ages of 18 and 20, Hart said. The sports utility vehicle was moving at the time of the shooting, which happened somewhere between Spring Street and Broadway. The men told police they were acquaintances of the victim and the shooting was an accident, Hart said, adding that no one was arrested. No other details were released because the investigation is ongoing.

“We haven’t determined what led up to the shooting and the circumstances,” Hart said Wednesday. “I wouldn’t rule it an accident or crime at this point.”

Police learned of the shooting after they were called to Kaiser Hospital in Redwood City at about 12:20 a.m. on June 12. Carranza, who had been brought to the hospital by unknown persons, died shortly after arriving there, Hart said.

The case will be forwarded to the San Mateo County District Attorney’s Office once the investigation is completed, Hart said.

“On the question of the shooting, the charges could be from homicide to unlawful possession of a firearm,” Hart said.

Email Bonnie Eslinger at beslinger@dailynewsgroup.com; follow her at twitter.com/bonnieeslinger.