LOS ANGELES — Up to 20 people were shot today at a social services office in San Bernardino, and officials said they were looking for one or more active shooters.

The San Bernardino Fire Department said the shooting took place on Waterman Avenue near Orange Show Road.

Sgt. Vicki Cervantes, a spokeswoman for the San Bernardino Police Department, said at the scene that up to three shooters were reported inside the Inland Regional Center. Officers have not secured the building and are going door to door.

The suspects, she said, are heavily armed and were possibly wearing body armor.

“It’s a very active scene,” Cervantes said. “It’s very fluid.”

Television news footage showed police officers and firefighters at the scene as well as people being escorted out of the area.

Officials said they received a call about a shooting about 11 a.m. PST.

One man whose his wife worked in the building told KABC-TV that at least one gunman walked into the center and opened fire. She was able to lock herself in her office.

“They saw bodies on the floor,” he said.

The Inland Regional Center provides services to disabled people and others in need.