BERKELEY, Calif. (KGO) -- The attack happened in Wheeler Hall, a classroom building that also houses offices for professors. Police say a female employee encountered the man in the restroom at 1:35 a.m. and told him the building was closed. He then followed her as she left.
Sgt. Nicolas Hernandez with U.C. police said, "She had entered a restroom and asked the individual to leave and he didn't, so he assaulted her with the caustic chemical."
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The Berkeley fire department says the chemical was ammonia. The employee suffered from chemical burns. Paramedics worked on her at Wheeler Hall and then she was taken to a nearby hospital. Students and staff learned about the attack Wednesday afternoon after Cal police sent out a campuswide alert.
Police aren't saying how the man got into the building or why he attacked as they continue their investigation.