The latest updates from the day of the shooting are at the bottom. See our most recent story, “San Bernardino Shooters Were on a 'Mission,'” here.

Multiple people were struck in a mass shooting in the city of San Bernardino today, authorities said.

San Bernardino Fire Department officials said 20 injuries were reported at a location in the 1300 block of S. Waterman Ave. Reports indicate the location is the Inland Regional Center, a state facility for people with developmental disabilities.

There were initial reports of possible multiple gunman and multiple casualties, but the scene seemed chaotic and confirmation was not secured.

Stay tuned for updates.

UPDATE at 12:08 p.m., Wednesday, Dec. 2, 2015: Cindy Bachman of the San Bernardino County Sheriff's Department told us initial reports indeed indicated one to three possible shooters with multiple people injured at the center.

She says her department was first notified of the situation at 11:04 a.m.

“We do have multiple ground units there and our SWAT team and a helicopter,” she said. 

Bachman added that law enforcement agencies from around the Inland Empire have responded to the scene.

Nancy Lungren, assistant director of communications for the California Department of Developmental Services confirmed that the shooting took place at the state's San Bernardino facility.

She wasn't initially sure how many people were employed at the facility. 

UPDATE at 12:40 p.m., Wednesday, Dec. 2, 2015: An FBI spokeswoman confirmed that federal agents were en route to the scene.

UPDATE at 12:51 p.m., Wednesday, Dec. 2, 2015: Loma Linda University Medical Center said in a statement that it's “expecting an influx of patients” from the shooting. Exact numbers weren't available.

Multiple outlets, including KNX 1070 Newsradio, report that at least one gunman entered a conference room full of people at the facility and opened fire.

UPDATE at 1:11 p.m., Wednesday, Dec. 2, 2015: Sgt. Vicki Cervantes of the San Bernardino Police Department told reporters at the scene that there have indeed been fatalities.

“We don't have numbers yet on casualties but there are multiple casualties and there are confirmed fatalities,” she said.

Multiple shooters entered the location and “started shooting” this morning, Cervantes said.

“We were told at least one of the shooters may have left in a black SUV,” she said.

Witness Juan Hernandez of Rialto told ABC Eyewitness News that a suspect was in military fatigues and left in a black SUV.