A man in his 20s was stabbed to death early Sunday in downtown Petaluma, just as many of the bars and nightclubs in the area were closing.

Officers responded around 1:45 a.m. to a report of a stabbing in the 100 block of Kentucky Street. They located the victim in the Golden Concourse, a pedestrian walkway between Kentucky and Keller streets.

He was taken to Memorial Hospital in Santa Rosa where he died.

A second victim received a cut to his arm and was treated at the scene, according to police.

Police said the two victims knew each other, but didn’t know their connection to their assailant.

“As of now we don’t know what led up to the incident. We’re unsure of who the suspect is,” said Lt. Tim Lyons.

He said the assailant may also have been injured because of a blood trail officers followed.

“It looks like he fled on foot up ‘Telephone Alleyway,’ onto Washington Street, then southbound on Keller Street and into Keller Street garage. That’s when we lost the trail,” Lyons said.

He said it is likely the suspect got into a vehicle.

“We’re trying to see if witnesses may have seen a person fleeing, or a vehicle fleeing the area,” Lyons said.

The Keller Street garage was cordoned off with crime scene tape as detectives gathered evidence from the stabbing.

Two witnesses, including a Kentucky Street bar bouncer who did not give his name, said the man who died was stabbed in the stomach. He came out of the bar to see the man lying on the ground with bystanders trying to revive him.

“He was in and out of consciousness,” the bouncer said.

Police said the identity of the victim was being withheld pending notification of next of kin.

Anyone with information about this incident is asked to contact Detective Walt Spiller at 707-778-4372

You can reach Staff Writer Clark Mason at 707-521-5214 or clark.mason@pressdemocrat.com. On Twitter@clarkmas.

You can reach Staff Writer Paul Payne at 707-568-5312 or paul.payne@pressdemocrat.com. On Twitter @ppayne.