[Breaking news update, posted at 2:57 p.m. ET]
CNN affiliate KABC reported that the shooting took place at Inland Regional Center, a facility for people with developmental disabilities.
Inland Regional Center’s Facebook page says it employs nearly 670 staff at its facilities in San Bernardino and Riverside counties, providing services to more than 30,200 people.
It aims to “work on a personal, one-on-one basis with people with developmental disabilities to make their lives better as they define it.”
It is unclear how many people were at the San Bernardino facility at the time of the shooting.
[Previous story, posted at 2:48 p.m. ET]
Police in San Bernardino, California, tweeted a warning Wednesday that there was an active shooter situation.
There were one to three suspects, the San Bernardino County Sheriff’s Department tweeted, citing the police department.
The sheriff’s department also tweeted that there was an “active shooter in the area of Orange Show Rd/Waterman Ave near Park Center.”
It urged people to avoid the area.
The San Bernardino Fire Department said on Twitter it was responding to reports of a “20 victim shooting incident.”
San Bernardino is a city of just over 200,000 people located 60 miles east of Los Angeles.