Investigators were working to identify the shooter or shooters who fatally struck a teenager in Azusa on Tuesday.
Officials were called regarding a gunshot victim on the 300 block of South Enid Avenue just before 3 p.m., said Los Angeles County Sheriff's Lt. Rodney Moore.
The victim, who is believed to be 14 years old, was found with multiple gunshot wounds in his upper torso, Moore said.
He was transported to a nearby hospital, where he was pronounced dead.
The boy appears to have been riding his bike when he was shot, Moore added, though the other circumstances surrounding the incident remain unclear.
Edgar Carrillo, who lives nearby, said he was sitting down to eat when he heard about eight or nine gunshots ring out.
"They tried performing CPR then pretty much it was a wrap," Carrillo said of the teen's condition. "He wasn't responding."
The victim has not been identified, but sheriff's officials described him as Latino and said he lives in Azusa.
There are no other known injuries, according to Moore.
No weapon was recovered at the scene. Detectives were working to gather evidence and witness testimony that could help them identify the suspect or suspects involved.
It's unknown if the shooting was gang-related, investigators said.
Carrillo told KTLA he hadn't experience anything like the shooting in his 27 years of living in the "quiet" neighborhood, which he described as "just a lot of families trying to raise their kids and nothing like this goes on at all."
It is the second homicide in Azusa is just five days, according to the San Gabriel Valley Tribune.
William Perez, 21, was fatally shot from behind outside an apartment building where he was visiting friends on Friday, April 27. No arrests have been made in that case, either, the newspaper reported.
The two shootings were the first reported homicides in Azusa this year, according to data compiled by the Los Angeles Times.
Investigators were working to determine whether the two shooting deaths could be connected.