Foam used to wash blood from River Street in Lewiston is the only evidence that remains Sunday morning after a man was shot and killed Saturday night. Witnesses said the victim, Hassan Hassan, 18, was shot multiple times while running down Oxford Street, in background, and River Street. He was taken to Central Maine Medical Center in Lewiston, where he died. Russ Dillingham/Sun Journal

LEWISTON — Local and Maine State police are investigating a shooting Saturday night on River Street in Lewiston that left an 18-year-old man dead.

Hassan Hassan of Lewiston died at Central Maine Medical Center at 2:44 a.m. Sunday, according to the State Police.

Following an autopsy by the Office of Chief Medical Examiner, Hassan’s death was ruled a homicide.

Detectives with the State Police were continuing Sunday to work with the Lewiston Police Department to interview witnesses, according to Katy England, spokeswoman for the Maine Department of Public Safety.

“Due to the nature of injuries, the Maine State Police Major Crimes Unit was immediately called in to assist Lewiston officers and detectives with the investigation,” according to a statement released Sunday morning by Lewiston police.

Lewiston police learned of the shooting at about 7:35 p.m. Saturday.

Maine State Police and Lewiston police were at the scene of the shooting Sunday.

State Police are overseeing the investigation.

Police said they do not believe there is an ongoing threat to the public.

Anyone with information about the incident should call the Lewiston Police Department at 207-513-3000 or Maine State Police at 207-624-7076, Ext. 9.