A suspect was in custody, and was being transported to a hospital for medical treatment after being shot by police, FOX 11 of Los Angeles reported.
“An officer-involved shooting occurred,” was one of the few initial details the Orange County Police Department posted on Facebook. More information from the department was expected later Wednesday evening.
Police arrived at the scene around 5:30 p.m. PT after receiving a report about gunfire, FOX 11 reported. Authorities said four people were found dead and a fifth person, in addition to the suspect, was taken to a hospital.
Authorities did not immediately know why the child was at the scene, FOX 11 reported.
The shooting took place on the second floor of an office building but the name of the specific business was not immediately known, the Los Angeles Daily News reported. The building where the shooting occurred houses several businesses, the report said.
Officers were fired upon when they arrived, Lt. Jennifer Amat, a spokeswoman for the Orange Police Department, told the Los Angeles Times.
A separate Facebook video posted by a nearby resident showed police officers recovering two weapons from a person who was lying motionless, and showed other officers leading two people away in handcuffs, the Daily News reported.
The scene was stabilized by 7 p.m. PT and there was no longer a threat to the public, the Orange Police Department told Fox News.
Orange, a city of about 140,000 residents, is located about 30 miles southeast of downtown Los Angeles.
The shooting marked the third mass shooting in the U.S. in the past two weeks, following shootings in Atlanta that left eight people dead and one in Boulder, Colorado, that left 10 dead.
This is a developing story. Check back for updates.