ULTAN (INP): A teacher was thrashed and his face was blackened with soot by locals for allegedly sexually assaulting a 12-year-old student here on Sunday. The teacher invited a student at his place in Naqshband Colony for tuition and subjected him to sexual assault. Locals and the child family gathered and beat the teacher up and blackened his face. The enraged residents also paraded him in the colony. They said the accused had confessed to subjecting other kids to sexual assault as well.