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Jae C. Hong, Associated Press
People who were near a shooting rampage at a social services center that killed multiple people and wounded others arrive at at a community center to reunite with their family members in San Bernardino, Calif., Wednesday, Dec. 2, 2015.

SAN BERNARDINO, Calif. — Family and friends of those who worked at the Southern California building where at least 14 people were killed anxiously tried to make sure they were safe.

Sherry Esquerra says she was trying to reach her daughter and son-in-law Wednesday at the Inland Regional Center in San Bernardino, where they work with people with developmental disabilities.

Police say as many as three gunmen stormed into the center before noon and began shooting.

Esquerra was holding back tears as her calls went to voicemail.

Sheela Stark, a board member at the center, was trying to reach more than a dozen colleagues and workers, but had heard back from only one.

She says she's trying to stay positive by watching the news on TV and looking for familiar faces.