SAN DIEGO - San Diego police are investigating Monday two separate shootings that occurred over the weekend.

The first shooting involved a 26-year-old man who was shot in the back while walking in the Paradise Hills neighborhood. The victim is expected to survive.

The shooting on Saipan Drive near Potomac Street was reported just before 7 p.m. Sunday, according to San Diego police Officer David Stafford.

The victim walked several blocks to his girlfriend's house and she drove him to Paradise Valley Hospital in National City, the officer said in a statement.

From there, medics took the wounded man to Scripps Mercy Hospital, Stafford said, describing the wound as not life-threatening.

Police were looking for a Hispanic man, 30-35 years old, 5 feet 6 to 5 feet 7 and 185-200 pounds, with tattoos on his arms and a tattoo of a woman's face on his neck. He wore a white shirt with shorts and fled northbound from the shooting in a small blue Dodge 1500 pickup with two female passengers, Stafford said.

Two other men were hospitalized Monday with multiple gunshot wounds following a separate apparent gang-related attack in the backyard of a Fairmount home, police said.

The men, ages 21 and 27, were shot in the 3800 block of 47th Street around 9 p.m. Sunday, according to San Diego police Officer David Stafford.

They were in the backyard when two other males appeared armed with shotguns and fired several rounds, striking both victims multiple times in their backs and upper torsos, Stafford said in a statement. Medics took the victims to an area hospital with non-life threatening wounds, he said.

The shooters fled on foot. Police described one of them as a thin, bald Hispanic man, 16-20 years old and around 5 feet 8, last seen wearing a gray jacket and blue jeans. A description of the second shooter was not immediately available, Stafford said.

Gang detectives are investigating both incidents.