December 02, 2015 06:15 PM

Marybeth Field, president of Inland Regional Center in San Bernardino, tells PEOPLE three shooters stormed the conference center building of the organization’s three-building campus, where the San Bernardino County’s Department of Public Health had rented out the facility.

“They were having a conference there,” Field tells PEOPLE, explaining that the conference center has the least amount of security. “They were having a party or a conference there. It was open for people to come into.” Inland Regional Center is a facility that provides services to people with mental and developmental disabilities.

The incident has left 14 dead and 14 injured, according to the most recent reports. The suspects are still at large.

“[The shooters] went into the conference room. They didn’t go into the main building. Everybody is curious as to why they went there – it’s the easiest room to get into. The rest of the facility, you wouldn’t get very far,” Field says.

The conference center includes multiple conference rooms, a library, coffee shop and offices, Field says.

“This seems very strange that someone would target us. We provide services. We’re a service provider. I don’t understand why anyone would have an issue.”

Field spoke with several employees following the incident. “At the time people were injured, other people were hiding, they were being evacuated, it was a little bit chaotic. No one was allowed in the area. The police were very quick to respond.”

“This is just totally unbelievable,” she says. “I can’t even fathom that somebody would want to hurt people who help people.”

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