Parents inquiring about whether their children were involved can call (805) 893-3901. Counselors will be available at (805) 893-4411.
Brown said he and his wife, Anne Gust Brown, "were saddened to learn of this senseless tragedy."
In a statement released in Sacramento, Brown added that "our thoughts and prayers go out to those mourning the loss of their loved ones during this difficult time.''
University of California President Janet Napolitano said the university has set up a room for arriving families to handle their questions.