A 52-year-old Long Beach man was killed by a hit-and-run driver Sunday evening, according to police, who said they’re still trying to determine how the crash happened and who the driver was.

Police said officers first responded around 5:25 p.m. Sunday to the crash on a service road that provides access to the bed of the Los Angeles River north of Willow Street near the 710 Freeway where Long Beach Fire Department personnel were already working on an injured pedestrian.

Fire personnel determined that the man was dead, and a preliminary investigation found that the man’s injuries were consistent with being struck by a vehicle, according to police.

The department said investigators are still trying to determine how the crash happened.

The 52-year-old victim’s identity is being withheld at this time while the Los Angeles County Coroner’s Office works to notify his family.

Police said that the vehicle that struck the man fled the scene prior to officers arriving and an investigation is ongoing. The department is asking anyone with information regarding the incident to contact the LBPD collision detail at 562-570-7355.