Oebisfelde (dpa/sa) - After a threat at a school in Oebisfelde in the Börde district, classes are to take place as usual on Wednesday. However, the police are still on site and the investigation is ongoing, as the police said in the morning. "The threat is being taken seriously," said a spokesman. Because of a threat, there was a police operation at the school early Tuesday evening. The threat was "unspecific", but there was no concrete risk, the police said on Tuesday evening.