Police officers transport bystanders from the area after at least one person opened fire at a social services agency in San Bernardino, California, Dec. 2, 2015. Mario Anzuoni/Reuters

Local San Bernardino, California, authorities were investigating an active-shooter incident near Waterman Avenue and Orange Show Road, where as many as 20 people were reportedly shot shortly after 3 p.m. EST, according to tweets from the local fire and police departments. The location is near Inland Regional Center, which treats people with disabilities, the New York Times reported. There were possibly as many as three gunmen involved, CNN reported.

The Washington Post launched a live feed from the scene, while other videos and photos immediately cropped up on social media:

Lt. Richard Lawhead told KTLA the first 911 call came in at 10:59 a.m. local time. He confirmed that several people were injured but gave no further specifics. “Who would think of such a thing to make an attack at that kind of facility?” Dave Hall, who has a daughter who attends the center, told the TV channel.

At 3:45 p.m. EST, or 12:45 p.m. local time, the San Bernardino County Sheriff’s Office tweeted that the scene was still active. The FBI and Bureau of Alcohol, Tobacco, Firearms and Explosives were en route to the scene at the center, which the Times reported has about 700 employees. It was still being evacuated, and no suspects were in custody, according to the Los Angeles Times.

Schools and workplaces remained on lockdown as authorities assessed the situation. The University of California at Riverside, which is about 10 miles away, tweeted that its administrators were monitoring the shooting but saw no risk to its campus. It added, "We advise everyone to remain out of that area."

Marco Aguilera told KABC that his wife was inside the center when shots were fired. "They locked themselves in her office," he said. "They seen bodies on the floor."

San Bernardino itself has more than 210,000 people. It's about 60 miles away from Los Angeles.