Officers responded to a report of a shooting that took place outside Pagano's Sports Bar at 14830 Washington Ave. at about 1:10 a.m., according to San Leandro police.
Responding officers pulled over a car that had just left the bar parking lot, and found a man inside the vehicle who had suffered a gunshot to the upper torso, police said.
Paramedics took the victim to a nearby hospital.
At about 1:40 a.m., officers contacted two men walking about a mile north of the shooting, according to police. One of the men matched a description of the alleged shooter.
Dario Santana Trevino was positively identified by several witnesses, who said that the shooting appeared to have stemmed from an argument that started inside the bar between female friends of the alleged shooter and the victim, police said.