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Police on Saturday were looking for a shooter responsible for gunfire that left two teens dead and wounded a third person in Pomona, Calif.

The incident began about 1:19 a.m. when police received numerous calls of shots heard in the 300 block of Orchid Lane.

The victims were identified as 13-year-old Justin Hansen and 16-year-old Andy Chavez, police said.

See original report at NBCLosAngeles.com

A makeshift memorial continued to grow Saturday evening for the slain boys, who friends said were "always together" and not in a gang.

Officers found the older victim dead at the scene. The 13-year-old was found in a nearby alley. He was taken to a hospital where he died. A third person -- the driver of a black car upon which the shooter opened fire -- was wounded and taken by helicopter to a hospital where he was listed in critical condition.

Chavez's friend, Stephanie Valdez, said she can't help but blame herself for the teen's death.

"'Cause I didn't pick him up," she said. "I didn't have my car, so I had no choice."

Valdez provided a photo of the boys.

A witness, who did not want to be identified due to safety concerns, said she saw two men open fire on a black car. The driver tried to get away, but slammed into the side of an apartment unit and then hit a parked blue car. She said the shooters fled and she called 911.

Another witness said she was asleep with her granddaughter when the black car plowed into her front room. No one in the apartment was hurt, she said.

Anyone with any information is urged to call the Pomona Police Department Homicide Detectives at 909-620-2095.