This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated.

SAN BERNARDINO, Calif. — There were initial reports of at least 20 victims down amid an active shooter incident at a center for people with developmental disabilities in San Bernardino late Wednesday morning, according to KTLA.

San Bernardino police said that 17 people were killed and 14 people were injured.

Click here for live coverage from FOX8’s sister station KTLA.

Officials said they do not know if this was a terrorist attack.

The incident was reported in the 1300 block of South Waterman Avenue, San Bernardino Fire tweeted shortly before 11:15 a.m.

Authorities said the situation is unfolding at the Inland Regional Center, a nonprofit that works with individuals with developmental disabilities.

There were possibly one to three shooters, the San Bernardino County Sheriff’s Department tweeted. They were described as wearing ski masks.

Agencies in the area were warned to be on the lookout for up to three men who fled a shooting there in a black, SUV-style vehicle, a local law enforcement official told CNN. The men are believed to be armed with AK-47-type weapons and possibly other automatic weapons. The warning came in a radio call that is being monitored by all law enforcement in the immediate area.

San Bernardino police used a robot to detonate a suspicious device found on the premises, according to the Los Angeles Times.

Marcos Aguilera’s wife was in the building when the gunfire erupted, ABC7 reported. He told ABC7 a shooter entered the building next to his wife’s office and opened fire.

“They locked themselves in her office. They seen bodies on the floor,” Aguilera said, adding that his wife saw ambulances taking people out of the building on stretchers.

Four adults have been transported to Loma Linda University Medical Center, and the hospital is expecting three more patients, hospital spokeswoman Briana Pastorino said.

A source who is employed at Arrowhead Regional Medical Center in California tells CNN the facility is on lockdown and has received eight victims from the shooting in San Bernardino.

Nearly 670 staff members provide services to 30,200 people with developmental disabilities and their families in San Bernardino and Riverside counties, according to the Inland Regional Center’s Facebook page.

Dave Hall, whose daughter goes to the facility, told KTLA that the center is used by those with mild to severe autism.

“Who would think of such a thing to make an attack at that kind of facility?” Hall said.

San Bernardino is a city of just over 200,000 people located 60 miles east of Los Angeles.