State health officials have added three more names to a growing list of students in this working-class town who are experiencing mysterious tics and twitching, while authorities on Saturday sought to assure parents the community’s high school is safe.

Although the symptoms are typically associated with Tourette Syndrome, that has been ruled out in all but one case, causing fear and confusion among many residents of Le Roy, N.Y., about 50 miles east of Buffalo.

“The building is safe for the community,” District Superintendent Kim Cox told several hundred residents gathered in the auditorium of Le Roy Junior-Senior High School on Saturday.