Police were called to an area school Friday, described by officials as an “isolated incident” involving a guest teacher. According to a letter sent home to parents of children at Holland Woods Middle School, a substitute teacher had made students uncomfortable by touching and invading their personal space. Port Huron Police responded to the school and the substitute teacher was removed. The incident is currently under investigation by Port Huron Schools and the Port Huron Police Department. No further details were provided by the school district, saying they will communicate further details if and w hen appropriate.