Officers also quickly found the suspected gunman who was taken into custody inside the same building, police said.
The victim is listed in stable condition and his injuries are non-life threatening, according to authorities.
Police were called to the scene around 1:45 Saturday morning and found a man with gunshot wounds to his lower body, a police spokeswoman said.
Police said they found bullet casings in the alley between Summit Street and 19th Street, where it appears the shooting took place.
It’s not clear yet if anyone was wounded, but officers were trying to determine if a person at a nearby hospital was a victim in the shooting, Long Beach police spokeswoman Arantxa Chavarria said.
The shooting took place near 65th Street and White Avenue near Coolidge Park in North Long Beach.
The driver of the vehicle suspected in the shooting was arrested for DUI after crashing on the 710 freeway.
The victim was shot in his lower body, police said.
Police do not yet believe the shootings are related to each other or gang related.
Rodney Willis, a 35-year-old Long Beach man, was arrested on Friday on suspicion of murder and a probation violation, according to authorities.